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	<title>人在岱北   静心聆泉 &#187; Gmail</title>
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		<title>祖冲之会写希腊字母？</title>
		<link>http://www.daibei.org/zu-chongzhi-write-the-greek-alphabet.html</link>
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		<pubDate>Mon, 20 Apr 2009 14:27:04 +0000</pubDate>
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				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[doodle]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[圆周率]]></category>
		<category><![CDATA[祖冲之]]></category>

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		<description><![CDATA[貌似今天是祖冲之诞辰1580周年，Google推出了纪念LOGO，据说这也是Google第一个中国人形象的doodle，看来祖冲之还是很有面子的。 不过，有点纳闷的是，虽然Google用圆代替了其中一个O，而且在下方写下了π=355/113的公式，不禁想问，祖冲之会希腊字母吗？ 显然，这个纪念doodle仅仅是展示了“圆周率”这个东西，而对于祖冲之来讲，仅仅能从355/113这个公式中了解出来，而如果不是用Google搜索了一下，我都不知道原来355/113是祖冲之算出来的圆周率的密率。 维基百科关于圆周率： 由于π的超越性，所以只能以近似值的方法计算π。对于一般应用3.14或已足够，但工程学常利用3.1416（5位有效数字）或3.14159（6位有效数字）。至于密率则是一个易于记忆（三个连续奇数：113355），且精确至7位有效数字的分数近似值。 [编辑] 实验时期 中国古籍云：“周三径一”[2]，意即取 π=3。西元前17世纪的埃及古籍《阿美斯纸草书》（Ahmes，又称“阿梅斯草片文书”；为英国人Alexander Henry Rhind（莱茵德）于1858年发现，因此还称“莱茵德纸草书” Rhind Papyrus）是世界上最早给出圆周率的超过十分位的近似值，为 256/81 ( = 3 + 1/9 + 1/27 + 1/81) 或 3.160。 至阿基米德之前，π值之测定倚靠实物测量。 [编辑] 几何法时期——反复割圆 阿基米德用正96边形割圆术得出圆周率介乎 与 之间。 西元263年，中国数学家刘徽用“割圆术”计算圆周率，他先从圆内接正六边形，逐次分割为12、24、48、96、192边形。他说“割之弥细，所失弥少，割之又割，以至于不可割，则与圆周合体而无所失矣。”（分割愈精细，误差愈少。分割之后再分割，直到不能再分割为止，它就会与圆周完全重叠，就不会有误差了），其中有求极限的思想。刘徽给出π=3.141024的圆周率近似值，并以 （徽率）为其分数近似值。 西元466年，中国数学家祖冲之将圆周率算到小数点后7位的精确度，这一纪录在世界上保持了一千年之久。同时，祖冲之给出了（密率）这个很好的分数近似值，它是分母小于10,000的简单分数中最接近π的。为纪念祖冲之对圆周率发展的贡献，日本数学家三上义夫将这一推算值命名为“祖冲之圆周率”，简称“祖率”。可惜祖冲之的著作《缀术》已经亡佚，后人无从得知祖冲之如何估算圆周率的值。 钱大昕的《十驾斋养新录》卷第十七首条〈圆径周率〉引《隋书律历志》：“古之九数，圆周率三圆径率一，其术疏舛，自刘歆、张衡、刘徽、王蕃、皮延宗之徒，各设新率，未臻折衷。宋末南徐州从事史祖冲之更开密率，以圆径一亿为一丈，圆周盈数三（刻本作二，误）丈一尺四寸一分五厘九毫二秒七忽，朒数三丈一尺四寸一分五厘九毫二秒六忽，正数在盈朒二限之间，密率圆径一百一十三，圆周三百五十五，约率圆径七，周二十二。又设开差幂、开差立，兼以正圆参之，指要精密，算氏之最者也。” [编辑] 分析法时期——无穷级数 这一时期人们开始摆脱利用割圆术的繁复计算，开始利用无穷级数或无穷连乘积求π。 Ludolph van &#8230;<table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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			<content:encoded><![CDATA[<p><img src="http://www.google.cn/logos/chongzhi09.gif" /> </p>
<p>貌似今天是祖冲之诞辰1580周年，Google推出了纪念LOGO，据说这也是Google第一个中国人形象的doodle，看来祖冲之还是很有面子的。</p>
<p>不过，有点纳闷的是，虽然Google用圆代替了其中一个O，而且在下方写下了π=355/113的公式，不禁想问，祖冲之会希腊字母吗？</p>
<p>显然，这个纪念doodle仅仅是展示了“圆周率”这个东西，而对于祖冲之来讲，仅仅能从355/113这个公式中了解出来，而如果不是用Google搜索了一下，我都不知道原来355/113是祖冲之算出来的圆周率的密率。</p>
<p> <span id="more-1010"></span>
<p><font style="background-color: #ffffff">维基百科关于圆周率：</font></p>
<blockquote><p>由于π的<a href="http://zh.wikipedia.org/w/index.php?title=%E8%B6%85%E8%B6%8A%E6%95%B8&amp;variant=zh-cn">超越性</a>，所以只能以<a href="http://zh.wikipedia.org/w/index.php?title=%E8%BF%91%E4%BC%BC%E5%80%BC&amp;action=edit&amp;redlink=1">近似值</a>的方法计算π。对于一般应用3.14或<img alt="\frac{22}{7}" src="http://upload.wikimedia.org/math/5/3/d/53d8a3eb29e4cfd5516f8e33673b292f.png" />已足够，但工程学常利用3.1416（5位<a href="http://zh.wikipedia.org/w/index.php?title=%E6%9C%89%E6%95%88%E6%95%B0%E5%AD%97&amp;variant=zh-cn">有效数字</a>）或3.14159（6位<a href="http://zh.wikipedia.org/w/index.php?title=%E6%9C%89%E6%95%88%E6%95%B0%E5%AD%97&amp;variant=zh-cn">有效数字</a>）。至于密率<img alt="\frac{355}{113}" src="http://upload.wikimedia.org/math/2/9/c/29cde9f6ad7ad117be486b19047272bd.png" />则是一个易于记忆（三个连续奇数：113355），且精确至7位有效数字的分数近似值。</p>
<p><a name=".E5.AF.A6.E9.A9.97.E6.99.82.E6.9C.9F"></a></p>
<h5>[<a href="http://zh.wikipedia.org/w/index.php?title=%E5%9C%93%E5%91%A8%E7%8E%87&amp;action=edit&amp;section=3">编辑</a>] 实验时期</h5>
<p>中国古籍云：“周三径一”<sup><a href="http://zh.wikipedia.org/#_note-1">[2]</a></sup>，意即取 π=3。西元<a href="http://zh.wikipedia.org/w/index.php?title=%E5%89%8D17%E4%B8%96%E7%B4%80&amp;variant=zh-cn">前17世纪</a>的埃及古籍《<a href="http://zh.wikipedia.org/w/index.php?title=%E9%98%BF%E7%BE%8E%E6%96%AF%E7%B4%99%E8%8D%89%E6%9B%B8&amp;action=edit&amp;redlink=1">阿美斯纸草书</a>》（<i>Ahmes</i>，又称“阿梅斯草片文书”；为英国人Alexander Henry Rhind（莱茵德）于1858年发现，因此还称“莱茵德纸草书” Rhind Papyrus）是世界上最早给出圆周率的超过<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8D%81%E9%80%B2%E5%88%B6&amp;variant=zh-cn">十分位</a>的近似值，为 256/81 ( = 3 + 1/9 + 1/27 + 1/81) 或 3.160。</p>
<p>至<a href="http://zh.wikipedia.org/w/index.php?title=%E9%98%BF%E5%9F%BA%E7%B1%B3%E5%BE%B7&amp;variant=zh-cn">阿基米德</a>之前，π值之测定倚靠实物测量。</p>
<p><a name=".E5.B9.BE.E4.BD.95.E6.B3.95.E6.99.82.E6.9C.9F.E2.80.94.E2.80.94.E5.8F.8D.E8.A6.86.E5.89.B2.E5.9C.93"></a></p>
<h5>[<a href="http://zh.wikipedia.org/w/index.php?title=%E5%9C%93%E5%91%A8%E7%8E%87&amp;action=edit&amp;section=4">编辑</a>] 几何法时期——反复割圆</h5>
<p><a href="http://zh.wikipedia.org/w/index.php?title=%E9%98%BF%E5%9F%BA%E7%B1%B3%E5%BE%B7&amp;variant=zh-cn">阿基米德</a>用正96边形割圆术得出圆周率介乎 <img alt="3\frac{1}{7}" src="http://upload.wikimedia.org/math/4/0/5/4059b0f0121d2627ece7d2796d05ee7c.png" />与 <img alt="3\frac{10}{71}" src="http://upload.wikimedia.org/math/b/8/3/b8375b353847ac7fa7922ee6794cca6a.png" />之间。</p>
<p>西元<a href="http://zh.wikipedia.org/w/index.php?title=263%E5%B9%B4&amp;variant=zh-cn">263年</a>，中国数学家<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8A%89%E5%BE%BD&amp;variant=zh-cn">刘徽</a>用“<a href="http://zh.wikipedia.org/w/index.php?title=%E5%89%B2%E5%9C%86%E6%9C%AF_(%E5%88%98%E5%BE%BD)&amp;variant=zh-cn">割圆术</a>”计算圆周率，他先从圆内接正六边形，逐次分割为12、24、48、96、192边形。他说“割之弥细，所失弥少，割之又割，以至于不可割，则与圆周合体而无所失矣。”（分割愈精细，误差愈少。分割之后再分割，直到不能再分割为止，它就会与圆周完全重叠，就不会有误差了），其中有求极限的思想。刘徽给出π=3.141024的圆周率近似值，并以 <img alt="{157 \over 50}=3.14" src="http://upload.wikimedia.org/math/d/6/3/d63d2b3791af0cd6589c96817092eda6.png" />（徽率）为其分数近似值。</p>
<p>西元<a href="http://zh.wikipedia.org/w/index.php?title=466%E5%B9%B4&amp;variant=zh-cn">466年</a>，中国数学家<a href="http://zh.wikipedia.org/w/index.php?title=%E7%A5%96%E6%B2%96%E4%B9%8B&amp;variant=zh-cn">祖冲之</a>将圆周率算到小数点后7位的精确度，这一纪录在世界上保持了一千年之久。同时，<a href="http://zh.wikipedia.org/w/index.php?title=%E7%A5%96%E6%B2%96%E4%B9%8B&amp;variant=zh-cn">祖冲之</a>给出了<img alt="{355 \over 113}" src="http://upload.wikimedia.org/math/1/9/1/191717478267094d0f3761538c315160.png" />（密率）这个很好的分数近似值，它是分母小于10,000的简单分数中最接近π的。为纪念<a href="http://zh.wikipedia.org/w/index.php?title=%E7%A5%96%E6%B2%96%E4%B9%8B&amp;variant=zh-cn">祖冲之</a>对圆周率发展的贡献，<a href="http://zh.wikipedia.org/w/index.php?title=%E6%97%A5%E6%9C%AC&amp;variant=zh-cn">日本</a>数学家<a href="http://zh.wikipedia.org/w/index.php?title=%E4%B8%89%E4%B8%8A%E7%BE%A9%E5%A4%AB&amp;variant=zh-cn">三上义夫</a>将这一推算值命名为“祖冲之圆周率”，简称“祖率”。可惜<a href="http://zh.wikipedia.org/w/index.php?title=%E7%A5%96%E6%B2%96%E4%B9%8B&amp;variant=zh-cn">祖冲之</a>的著作《缀术》已经亡佚，后人无从得知<a href="http://zh.wikipedia.org/w/index.php?title=%E7%A5%96%E6%B2%96%E4%B9%8B&amp;variant=zh-cn">祖冲之</a>如何估算圆周率的值。</p>
<p><a href="http://zh.wikipedia.org/w/index.php?title=%E9%8C%A2%E5%A4%A7%E6%98%95&amp;variant=zh-cn">钱大昕</a>的《十驾斋养新录》卷第十七首条〈圆径周率〉引《隋书律历志》：“古之九数，圆周率三圆径率一，其术疏舛，自刘歆、张衡、刘徽、王蕃、皮延宗之徒，各设新率，未臻折衷。宋末南徐州从事史祖冲之更开密率，以圆径一亿为一丈，圆周盈数三（刻本作二，误）丈一尺四寸一分五厘九毫二秒七忽，朒数三丈一尺四寸一分五厘九毫二秒六忽，正数在盈朒二限之间，密率圆径一百一十三，圆周三百五十五，约率圆径七，周二十二。又设开差幂、开差立，兼以正圆参之，指要精密，算氏之最者也。”</p>
<p><a name=".E5.88.86.E6.9E.90.E6.B3.95.E6.99.82.E6.9C.9F.E2.80.94.E2.80.94.E7.84.A1.E7.AA.AE.E7.B4.9A.E6.95.B8"></a></p>
<h5>[<a href="http://zh.wikipedia.org/w/index.php?title=%E5%9C%93%E5%91%A8%E7%8E%87&amp;action=edit&amp;section=5">编辑</a>] 分析法时期——无穷级数</h5>
<p>这一时期人们开始摆脱利用割圆术的繁复计算，开始利用<a href="http://zh.wikipedia.org/w/index.php?title=%E6%97%A0%E7%A9%B7%E7%BA%A7%E6%95%B0&amp;variant=zh-cn">无穷级数</a>或无穷连乘积求π。</p>
<p>Ludolph van Ceulen（约<a href="http://zh.wikipedia.org/w/index.php?title=1600%E5%B9%B4&amp;variant=zh-cn">1600年</a>）计算出π的小数点后首35位。他对此感到自豪，因而命人把它刻在自己的墓碑上。</p>
<p><a href="http://zh.wikipedia.org/w/index.php?title=%E6%96%AF%E6%B4%9B%E7%B6%AD%E5%B0%BC%E4%BA%9E%E4%BA%BA&amp;variant=zh-cn">斯洛文尼亚</a>数学家Jurij Vega于<a href="http://zh.wikipedia.org/w/index.php?title=1789%E5%B9%B4&amp;variant=zh-cn">1789年</a>得出π的小数点后首140位，其中有137位是正确的。这个世界纪录维持了五十年。他利用了John Machin于<a href="http://zh.wikipedia.org/w/index.php?title=1706%E5%B9%B4&amp;variant=zh-cn">1706年</a>提出的数式。</p>
<p>所有以上的方法都不能快速算出π。第一个快速算法由 Machin 提出：</p>
<dl>
<dd><img alt="\frac{\pi}{4} = 4 \arctan\frac{1}{5} - \arctan\frac{1}{239} " src="http://upload.wikimedia.org/math/f/1/5/f15dc3d39c473c4bd718e3a98145da0d.png" /></dd>
</dl>
<p>其中arctan(<i>x</i>) 可由<a href="http://zh.wikipedia.org/w/index.php?title=%E6%B3%B0%E5%8B%92%E7%BA%A7%E6%95%B0&amp;variant=zh-cn">泰勒级数</a>算出。类似方法称为“<a href="http://zh.wikipedia.org/w/index.php?title=%E9%A1%9EMachin%E7%AE%97%E6%B3%95&amp;action=edit&amp;redlink=1">类Machin算法</a>”。</p>
<p><a name=".E8.A8.88.E7.AE.97.E5.99.A8.E6.99.82.E4.BB.A3"></a></p>
<h5>[<a href="http://zh.wikipedia.org/w/index.php?title=%E5%9C%93%E5%91%A8%E7%8E%87&amp;action=edit&amp;section=6">编辑</a>] 计算器时代</h5>
<p>上万位以上的小数位值通常利用<a href="http://zh.wikipedia.org/w/index.php?title=Gauss-Legendre%E7%AE%97%E6%B3%95&amp;action=edit&amp;redlink=1">Gauss-Legendre算法</a>或<a href="http://zh.wikipedia.org/w/index.php?title=Borweins%E7%AE%97%E6%B3%95&amp;action=edit&amp;redlink=1">Borweins算法</a>；另外以往亦曾使用于<a href="http://zh.wikipedia.org/w/index.php?title=1976%E5%B9%B4&amp;variant=zh-cn">1976年</a>发现的 <a href="http://zh.wikipedia.org/w/index.php?title=Salamin-Brent%E7%AE%97%E6%B3%95&amp;action=edit&amp;redlink=1">Salamin-Brent算法</a>。</p>
<p>第一个π和 1/π的小数点后首一百万位利用了<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8F%A4%E8%85%BE%E5%A0%A1%E8%AE%A1%E5%88%92&amp;variant=zh-cn">古腾堡计划</a>。最新纪录是<a href="http://zh.wikipedia.org/w/index.php?title=2002%E5%B9%B4&amp;variant=zh-cn">2002年</a>九月得出的 1,241,100,000,000 个小数位，由拥有1TB主内存的64-node<a href="http://zh.wikipedia.org/w/index.php?title=%E6%97%A5%E7%AB%8B&amp;variant=zh-cn">日立</a><a href="http://zh.wikipedia.org/w/index.php?title=%E8%B6%85%E7%B4%9A%E9%9B%BB%E8%85%A6&amp;variant=zh-cn">超级电脑</a>，以每秒200亿运算速度得出，比旧纪录多算出一倍（206亿小数位）。此纪录由以下<a href="http://zh.wikipedia.org/w/index.php?title=%E9%A1%9EMachin%E6%BC%94%E7%AE%97%E6%B3%95&amp;action=edit&amp;redlink=1">类Machin算法</a>得出：</p>
<dl>
<dd><img alt=" \frac{\pi}{4} = 12 \arctan\frac{1}{49} + 32 \arctan\frac{1}{57} - 5 \arctan\frac{1}{239} + 12 \arctan\frac{1}{110443}" src="http://upload.wikimedia.org/math/5/2/4/524a01f928a2eddfb2d141f7d0089dd6.png" /> (K. Takano, <a href="http://zh.wikipedia.org/w/index.php?title=1982%E5%B9%B4&amp;variant=zh-cn">1982年</a>) </dd>
</dl>
<dl>
<dd><img alt=" \frac{\pi}{4} = 44 \arctan\frac{1}{57} + 7 \arctan\frac{1}{239} - 12 \arctan\frac{1}{682} + 24 \arctan\frac{1}{12943}" src="http://upload.wikimedia.org/math/2/0/e/20eeb32761f5204b35a62f50d7d1b2f5.png" /> (F. C. W. Störmer, <a href="http://zh.wikipedia.org/w/index.php?title=1896%E5%B9%B4&amp;variant=zh-cn">1896年</a>) </dd>
</dl>
<p>这么多的小数位没什么实用价值，只用以测试<a href="http://zh.wikipedia.org/w/index.php?title=%E8%B6%85%E7%B4%9A%E9%9B%BB%E8%85%A6&amp;variant=zh-cn">超级电脑</a>。</p>
<p><a href="http://zh.wikipedia.org/w/index.php?title=1996%E5%B9%B4&amp;variant=zh-cn">1996年</a>，David H. Bailey、Peter Borwein及<a href="http://zh.wikipedia.org/w/index.php?title=%E8%A5%BF%E8%92%99%E2%80%A2%E6%99%AE%E5%8B%9E%E5%A4%AB&amp;action=edit&amp;redlink=1">西蒙•普劳夫</a>发现了π的其中一个无穷级数：</p>
<dl>
<dd><img alt="\pi = \sum_{k = 0}^{\infty} \frac{1}{16^k}&#10;\left( \frac{4}{8k + 1} - \frac{2}{8k + 4} - \frac{1}{8k + 5} - \frac{1}{8k + 6}\right)" src="http://upload.wikimedia.org/math/f/9/7/f9733b62958be8751fbab97431c27af5.png" /></dd>
</dl>
<p>以上述公式可以计算π的第<i>n</i>个<a href="http://zh.wikipedia.org/w/index.php?title=%E4%BA%8C%E9%80%B2%E4%BD%8D&amp;variant=zh-cn">二进制</a>或<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8D%81%E5%85%AD%E9%80%B2%E4%BD%8D&amp;variant=zh-cn">十六进制</a>小数，而不需先计算首<i>n</i>-1 个小数位。此类π算法称为<a href="http://zh.wikipedia.org/w/index.php?title=Bailey-Borwein-Plouffe%E7%AE%97%E6%B3%95&amp;action=edit&amp;redlink=1">Bailey-Borwein-Plouffe算法</a>。请参考 <a href="http://www.nersc.gov/~dhbailey/">Bailey&#8217;s website</a> 上相关<a href="http://zh.wikipedia.org/w/index.php?title=%E7%A8%8B%E5%BC%8F&amp;variant=zh-cn">程式</a>。</p>
<p><a href="http://zh.wikipedia.org/w/index.php?title=Fabrice_Bellard&amp;action=edit&amp;redlink=1">Fabrice Bellard</a>于<a href="http://zh.wikipedia.org/w/index.php?title=1997%E5%B9%B4&amp;variant=zh-cn">1997年</a>给出了计算机效率上高出上式47%的BBP算法：</p>
<dl>
<dd><img alt="\pi = \frac{1}{2^6} \sum_{n=0}^{\infty} \frac{{(-1)}^n}{2^{10n}} \left( - \frac{2^5}{4n+1} - \frac{1}{4n+3} + \frac{2^8}{10n+1} - \frac{2^6}{10n+3} - \frac{2^2}{10n+5} - \frac{2^2}{10n+7} + \frac{1}{10n+9} \right)" src="http://upload.wikimedia.org/math/2/c/3/2c39b196c4eb238086f391bdc6acef7b.png" /></dd>
</dl>
<p>请参考 <a href="http://bellard.org/pi/">Fabrice Bellard&#8217;s PI page</a> 。</p>
<p>其他计算圆周率的公式包括：</p>
<dl>
<dd><img alt=" \frac{1}{\pi} = \frac{2\sqrt{2}}{9801} \sum^\infty_{k=0} \frac{(4k!)(1103+26390k)}{(k!)^4 396^{4k}} " src="http://upload.wikimedia.org/math/7/7/e/77e9fac37840591d2aea360317141f34.png" /> (拉马努金 Ramanujan) </dd>
</dl>
<dl>
<dd><img alt=" \frac{1}{\pi} = 12 \sum^\infty_{k=0} \frac{(-1)^k (6k)! (13591409 + 545140134k)}{(3k)!(k!)^3 640320^{3k + 3/2}} " src="http://upload.wikimedia.org/math/d/c/8/dc88cec756645fb4751542454081ac6d.png" /> (David Chudnovsky 及 Gregory Chudnovsky) </dd>
</dl>
<dl>
<dd><img alt="\pi = \frac {426880 \sqrt {10005}} {\sum_{k=0}^\infty \frac {(6n)!\ (545140134n + 13591409)} { (n!)^3\ (3n)!\ (-640320)^3n}} " src="http://upload.wikimedia.org/math/a/4/c/a4c0af1aa84f3fa7230a1fc372acc7cf.png" /><a href="http://www.jason314.com/">[1]</a></dd>
</dl>
<p>编写电脑程式时，也可以利用<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8F%8D%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0&amp;variant=zh-cn">反三角函数</a>直接定义 π 值，但是编译器必须具备<a href="http://zh.wikipedia.org/w/index.php?title=%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B8&amp;variant=zh-cn">三角函数</a>的函式库：      <br />利用<a href="http://zh.wikipedia.org/w/index.php?title=%E6%AD%A3%E5%BC%A6%E5%87%BD%E6%95%B0&amp;variant=zh-cn">正弦函数</a></p>
<dl>
<dd><img alt="\sin\left(\pi / 2 \right)=1" src="http://upload.wikimedia.org/math/6/4/f/64f14e66c0b441d309d6a3f675944628.png" /></dd>
<dd><img alt="\pi=2*\arcsin\left(1 \right)" src="http://upload.wikimedia.org/math/6/6/6/66620461dc653ec126f8f50f69e3c003.png" /></dd>
</dl>
<p>利用<a href="http://zh.wikipedia.org/w/index.php?title=%E4%BD%99%E5%BC%A6%E5%87%BD%E6%95%B0&amp;variant=zh-cn">余弦函数</a></p>
<dl>
<dd><img alt="\cos\left(\pi \right)=-1" src="http://upload.wikimedia.org/math/c/4/d/c4d2e738f486930f8f3b085587217ba1.png" /></dd>
<dd><img alt="\pi=\arccos\left(-1 \right)" src="http://upload.wikimedia.org/math/c/6/7/c67720de0e0f237606a36b4d9663da61.png" /></dd>
</dl>
<p>&#160;</p>
</blockquote>
<p>维基百科关于祖冲之：</p>
<blockquote><p><b>祖冲之</b>（<a href="http://zh.wikipedia.org/w/index.php?title=429%E5%B9%B4&amp;variant=zh-cn">429年</a>－<a href="http://zh.wikipedia.org/w/index.php?title=500%E5%B9%B4&amp;variant=zh-cn">500年</a>)，<a href="http://zh.wikipedia.org/w/index.php?title=%E8%A1%A8%E5%AD%97&amp;variant=zh-cn">字</a><b>文远</b>，<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8D%97%E5%8C%97%E6%9C%9D&amp;variant=zh-cn">南北朝</a>时期<a href="http://zh.wikipedia.org/w/index.php?title=%E6%95%B0%E5%AD%A6%E5%AE%B6&amp;variant=zh-cn">数学家</a>、<a href="http://zh.wikipedia.org/w/index.php?title=%E5%A4%A9%E6%96%87%E5%AD%A6%E5%AE%B6&amp;variant=zh-cn">天文学家</a>。</p>
<p>祖冲之祖籍范阳郡遒县（今<a href="http://zh.wikipedia.org/w/index.php?title=%E6%B2%B3%E5%8C%97&amp;variant=zh-cn">河北</a><a href="http://zh.wikipedia.org/w/index.php?title=%E6%B6%9E%E6%B0%B4&amp;variant=zh-cn">涞水</a>），为避战乱，祖冲之的祖父祖昌由河北迁至江南。祖昌曾任<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8D%97%E6%9C%9D%E5%AE%8B&amp;variant=zh-cn">刘宋</a>的“大匠卿”，掌管土木工程；祖冲之的父亲也在朝中做官。</p>
<p>祖冲之生于<a href="http://zh.wikipedia.org/w/index.php?title=%E5%BB%BA%E5%BA%B7&amp;variant=zh-cn">建康</a>（今<a href="http://zh.wikipedia.org/w/index.php?title=%E6%B1%9F%E8%8B%8F&amp;variant=zh-cn">江苏</a><a href="http://zh.wikipedia.org/w/index.php?title=%E5%8D%97%E4%BA%AC&amp;variant=zh-cn">南京</a>）。祖家历代都对天文历法素有研究，祖冲之从小就有机会接触天文、数学知识。祖冲之青年时，就得到博学多才的名声，<a href="http://zh.wikipedia.org/w/index.php?title=%E5%AE%8B%E5%AD%9D%E6%AD%A6%E5%B8%9D&amp;variant=zh-cn">宋孝武帝</a>听说后，派他到“华林学省”做研究工作。<a href="http://zh.wikipedia.org/w/index.php?title=461%E5%B9%B4&amp;variant=zh-cn">461年</a>，他在南徐州(今<a href="http://zh.wikipedia.org/w/index.php?title=%E6%B1%9F%E8%8B%8F&amp;variant=zh-cn">江苏</a><a href="http://zh.wikipedia.org/w/index.php?title=%E9%95%87%E6%B1%9F&amp;variant=zh-cn">镇江</a>)刺史府里从事，先后任南徐州从事史、公府参军。公元<a href="http://zh.wikipedia.org/w/index.php?title=464%E5%B9%B4&amp;variant=zh-cn">464年</a>他调至娄县(今<a href="http://zh.wikipedia.org/w/index.php?title=%E6%B1%9F%E8%8B%8F&amp;variant=zh-cn">江苏</a><a href="http://zh.wikipedia.org/w/index.php?title=%E6%98%86%E5%B1%B1&amp;variant=zh-cn">昆山</a>东北)任县令。在此期间他编制了《<a href="http://zh.wikipedia.org/w/index.php?title=%E5%A4%A7%E6%98%8E%E6%9B%86&amp;variant=zh-cn">大明历</a>》，计算了<a href="http://zh.wikipedia.org/w/index.php?title=%E5%9C%86%E5%91%A8%E7%8E%87&amp;variant=zh-cn">圆周率</a>。宋朝末年，祖冲之回到建康任谒者仆射，此后直到宋灭亡一段时间后，他花了较大精力来研究机械制造。<a href="http://zh.wikipedia.org/w/index.php?title=494%E5%B9%B4&amp;variant=zh-cn">494年</a>到<a href="http://zh.wikipedia.org/w/index.php?title=498%E5%B9%B4&amp;variant=zh-cn">498年</a>之间，他在<a href="http://zh.wikipedia.org/w/index.php?title=%E5%8D%97%E9%BD%90&amp;variant=zh-cn">南齐</a>朝廷担任长水校尉一职，受四品俸禄。鉴于当时战火连绵，他写有《安边论》一文，建议朝廷开垦荒地，发展农业，安定民生，巩固国防。祖冲之在他72岁时去世。</p>
<p>祖冲之的主要成就在<a href="http://zh.wikipedia.org/w/index.php?title=%E6%95%B0%E5%AD%A6&amp;variant=zh-cn">数学</a>、天文历法和机械制造三个领域。此外历史记载祖冲之精通音律，擅长下棋，还写有小说《述异记》。祖冲之著述很多，但大多都已失传。</p>
<p>祖冲之的儿子<a href="http://zh.wikipedia.org/w/index.php?title=%E7%A5%96%E6%9A%85%E4%B9%8B&amp;variant=zh-cn">祖暅之</a>也是数学家。</p>
<p>为纪念祖冲之，人们将<a href="http://zh.wikipedia.org/w/index.php?title=%E6%9C%88%E7%90%83&amp;variant=zh-cn">月球</a>背面的一座<a href="http://zh.wikipedia.org/w/index.php?title=%E7%8E%AF%E5%BD%A2%E5%B1%B1&amp;variant=zh-cn">环形山</a>命名为“祖冲之环形山”，将<a href="http://zh.wikipedia.org/w/index.php?title=%E5%B0%8F%E8%A1%8C%E6%98%9F1888&amp;variant=zh-cn">小行星1888</a>命名为“祖冲之小行星”，<a href="http://zh.wikipedia.org/w/index.php?title=%E4%B8%8A%E6%B5%B7&amp;variant=zh-cn">上海</a><a href="http://zh.wikipedia.org/w/index.php?title=%E6%B5%A6%E4%B8%9C&amp;variant=zh-cn">浦东</a><a href="http://zh.wikipedia.org/w/index.php?title=%E5%BC%A0%E6%B1%9F%E9%AB%98%E7%A7%91%E6%8A%80%E5%9B%AD%E5%8C%BA&amp;variant=zh-cn">张江高科技园区</a>内有一条城市道路命名为“祖冲之路”。</p>
</blockquote>
<p>×××××××××××××郁闷的分割线×××××××××××××××××××</p>
<p>今天IE8下面Gmail出现了一些问题，版面混乱，不知道大家有没有出现这种情况：</p>
<p><a href="http://tvcqiw.blu.livefilestore.com/y1p1KLT0X4FY0m7iAzy6URQyRmFNvbOW577NGGIBBkkbOS-QkUua8xFFzqQysnEujXzf_3F_rdU5FMv9to03vz02A/gmail.jpg"><img alt="" src="http://tvcqiw.blu.livefilestore.com/y1p1KLT0X4FY0m7iAzy6URQyQya_7LbWQ7A7VwaTqlX9Ch0XuAtFW8yM4HR55tl-A5sFd-FIBGnLwL-ZhPLRg0WTQ/gmail.jpg" width="600" height="356" /></a></p>
<p><a href="http://tvcqiw.blu.livefilestore.com/y1p_tgt376h087PlLxlscYJdiUmfFwDYHozfB0OoQTXaRRYAYRawtonKIpAajNs7gYcHPKU-eMFHNwO3u0MEyvg6A/gmail2.jpg"><img alt="" src="http://tvcqiw.blu.livefilestore.com/y1p_tgt376h087PlLxlscYJdr1KVvEqnYAKPNoqGxWBY4M9E9kL-5eeRMTBLkFda76K2xfokdwUqXkQOyYO-am8zA/gmail2.jpg" width="600" height="293" /></a></p>
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		<title>Gmail开始支持编辑邮件插图</title>
		<link>http://www.daibei.org/gmail-started-to-support-the-editorial-illustrations-mail.html</link>
		<comments>http://www.daibei.org/gmail-started-to-support-the-editorial-illustrations-mail.html#comments</comments>
		<pubDate>Sat, 11 Apr 2009 13:30:31 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[图片]]></category>
		<category><![CDATA[邮件]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/gmail-started-to-support-the-editorial-illustrations-mail.html</guid>
		<description><![CDATA[<p>以前如果想往Gmail里面插入图片其实也不难，直接在一些网站上选定图片，然后ctrl+C然后Ctrl+V就OK了，但是如果你想直接在邮件编辑中插入图片，貌似是一项不可完成的任务………………<a href='http://www.daibei.org/gmail-started-to-support-the-editorial-illustrations-mail.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p><table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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</table>]]></description>
			<content:encoded><![CDATA[<p>以前如果想往Gmail里面插入图片其实也不难，直接在一些网站上选定图片，然后ctrl+C然后Ctrl+V就OK了，但是如果你想直接在邮件编辑中插入图片，貌似是一项不可完成的任务………………<a href='http://www.daibei.org/gmail-started-to-support-the-editorial-illustrations-mail.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
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		<slash:comments>10</slash:comments>
		</item>
		<item>
		<title>Gmail 出现短时&#8220;502 Server Error&#8221;</title>
		<link>http://www.daibei.org/gmail-appeared-502-server-error.html</link>
		<comments>http://www.daibei.org/gmail-appeared-502-server-error.html#comments</comments>
		<pubDate>Tue, 24 Feb 2009 11:40:53 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[502 Server Error]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[Google]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/gmail-appeared-502-server-error.html</guid>
		<description><![CDATA[<p>今天照常打开浏览器，登录Gmail，结果却发现，Google给我了一个“502 Server Error”………………<a href='http://www.daibei.org/gmail-appeared-502-server-error.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p><table class="wumii-related-items" cellspacing="0" cellpadding="3" border="0"  style="clear: both;">
    
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                        <img style="margin: 0 !important; padding: 2px !important; border: 1px solid #DDDDDD !important; width: 96px !important; height: 96px !important;" src="http://static.wumii.com/site_images/2011/09/21/32670086.png" width="96px" height="96px" /><br />
                        <font size="-1" color="#333333" style="display: block !important; line-height: 15px !important; width: 102px !important; font: 12px/15px arial !important; height: 60px !important; margin: 3px 0 0 0 !important; padding: 0 !important; overflow: hidden !important;">以Gmail为例分享邮件处理之道 (@pkmlife)</font>
                    </a>
                </td>
                <td width="102" valign="top" style="padding: 5px !important; margin: 0 !important; border-left: 1px solid #DDDDDD !important;">
                    <a target="_blank" title="Google官方无厘头外设之Gmail卫衣" style="text-decoration: none !important; cursor: pointer !important;" href="http://app.wumii.com/ext/redirect.htm?url=http%3A%2F%2Fwww.toodaylab.com%2F10188&from=http%3A%2F%2Fwww.daibei.org%2Fgmail-appeared-502-server-error.html">
                        <img style="margin: 0 !important; padding: 2px !important; border: 1px solid #DDDDDD !important; width: 96px !important; height: 96px !important;" src="http://static.wumii.com/site_images/2010/12/07/1175672.jpg" width="96px" height="96px" /><br />
                        <font size="-1" color="#333333" style="display: block !important; line-height: 15px !important; width: 102px !important; font: 12px/15px arial !important; height: 60px !important; margin: 3px 0 0 0 !important; padding: 0 !important; overflow: hidden !important;">Google官方无厘头外设之Gmail卫衣 (@toodaylab)</font>
                    </a>
                </td>
        </tr>
    
    <tr>
        <td colspan="5" align="right">
            <a style="text-decoration: none !important;" href="http://www.wumii.com/widget/relatedItems.htm" target="_blank" title="无觅相关文章插件">
                <font size="-1" color="#bbbbbb" style="display: block !important; font-family: arial !important; padding: 5px 0 !important; font-size: 12px !important; color: #bbb !important;">无觅</font>
            </a>
        </td>
    </tr>
</table>]]></description>
			<content:encoded><![CDATA[<p>今天照常打开浏览器，登录Gmail，结果却发现，Google给我了一个“502 Server Error”………………<a href='http://www.daibei.org/gmail-appeared-502-server-error.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/gmail-appeared-502-server-error.html/feed</wfw:commentRss>
		<slash:comments>6</slash:comments>
		</item>
		<item>
		<title>Gmail界面做出微调</title>
		<link>http://www.daibei.org/gmail-interface-to-make-fine-tuning.html</link>
		<comments>http://www.daibei.org/gmail-interface-to-make-fine-tuning.html#comments</comments>
		<pubDate>Wed, 04 Feb 2009 02:59:55 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[Gmail]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/gmail-interface-to-make-fine-tuning.html</guid>
		<description><![CDATA[<p>Gmail的邮件列表和邮件上方的快捷标签变动了一下，貌似同样是全球统一变动，英文版Gmail和中文版Gmail同时调整了：…………<a href='http://www.daibei.org/gmail-interface-to-make-fine-tuning.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></description>
			<content:encoded><![CDATA[<p>Gmail的邮件列表和邮件上方的快捷标签变动了一下，貌似同样是全球统一变动，英文版Gmail和中文版Gmail同时调整了：…………<a href='http://www.daibei.org/gmail-interface-to-make-fine-tuning.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/gmail-interface-to-make-fine-tuning.html/feed</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Google最近几天的更新</title>
		<link>http://www.daibei.org/google-recently-updated-a-few-days.html</link>
		<comments>http://www.daibei.org/google-recently-updated-a-few-days.html#comments</comments>
		<pubDate>Fri, 21 Nov 2008 14:30:43 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[doodle]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[IME]]></category>
		<category><![CDATA[Themes]]></category>
		<category><![CDATA[我的站]]></category>
		<category><![CDATA[谷歌拼音输入法]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/google-recently-updated-a-few-days.html</guid>
		<description><![CDATA[<p>1、<strong>Google发布了</strong><a href="http://www.daibei.org/google-pinyin-input-method-of-the-status-bar-is-missing.html" target="_blank"><strong>谷歌拼音输入法</strong></a><strong>2.0测试版</strong>，现在正在使用，感觉还可以，有点向微软拼音靠拢的迹象。但是实在不知道谷歌这个版本的与1.X之间有哪些让使用者更优体验的质的飞跃………………<a href='http://www.daibei.org/google-recently-updated-a-few-days.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></description>
			<content:encoded><![CDATA[<p>1、<strong>Google发布了</strong><a href="http://www.daibei.org/google-pinyin-input-method-of-the-status-bar-is-missing.html" target="_blank"><strong>谷歌拼音输入法</strong></a><strong>2.0测试版</strong>，现在正在使用，感觉还可以，有点向微软拼音靠拢的迹象。但是实在不知道谷歌这个版本的与1.X之间有哪些让使用者更优体验的质的飞跃………………<a href='http://www.daibei.org/google-recently-updated-a-few-days.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/google-recently-updated-a-few-days.html/feed</wfw:commentRss>
		<slash:comments>18</slash:comments>
		</item>
		<item>
		<title>用Gmail进行视频聊天</title>
		<link>http://www.daibei.org/gmail-chat-with-video.html</link>
		<comments>http://www.daibei.org/gmail-chat-with-video.html#comments</comments>
		<pubDate>Thu, 13 Nov 2008 10:51:30 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[视频聊天]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/gmail-chat-with-video.html</guid>
		<description><![CDATA[<p>Gmail又更新了，今天早上登录Gmail之后，Google用红色的字体告诉我：Gmail又有了新功能：…………<a href='http://www.daibei.org/gmail-chat-with-video.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></description>
			<content:encoded><![CDATA[<p>Gmail又更新了，今天早上登录Gmail之后，Google用红色的字体告诉我：Gmail又有了新功能：…………<a href='http://www.daibei.org/gmail-chat-with-video.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/gmail-chat-with-video.html/feed</wfw:commentRss>
		<slash:comments>5</slash:comments>
		</item>
		<item>
		<title>Gmail生日快乐</title>
		<link>http://www.daibei.org/gmail-happy-birthday.html</link>
		<comments>http://www.daibei.org/gmail-happy-birthday.html#comments</comments>
		<pubDate>Tue, 01 Apr 2008 13:37:17 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[Gmail]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/?p=428</guid>
		<description><![CDATA[<p class="MsoNormal" style="margin: 0cm 0cm 10pt;"><span style="font-size: small;"><span style="font-family: " lang="EN-US">…………<a href='http://www.daibei.org/gmail-happy-birthday.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></description>
			<content:encoded><![CDATA[<p class="MsoNormal" style="margin: 0cm 0cm 10pt;"><span style="font-size: small;"><span style="font-family: " lang="EN-US">…………<a href='http://www.daibei.org/gmail-happy-birthday.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/gmail-happy-birthday.html/feed</wfw:commentRss>
		<slash:comments>12</slash:comments>
		</item>
		<item>
		<title>Gmail出现故障？</title>
		<link>http://www.daibei.org/gmail%e5%87%ba%e7%8e%b0%e6%95%85%e9%9a%9c%ef%bc%9f.html</link>
		<comments>http://www.daibei.org/gmail%e5%87%ba%e7%8e%b0%e6%95%85%e9%9a%9c%ef%bc%9f.html#comments</comments>
		<pubDate>Thu, 28 Feb 2008 04:29:47 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[Firefox]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[Google]]></category>
		<category><![CDATA[theword]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/?p=370</guid>
		<description><![CDATA[<p>    今天早上上班之后，像往常一样打开我的邮箱，但是Gmail的显示一直都是Loading，而过了很久都没有加载完毕，以为是网络的问题（以前遇到过这样的情况，网速比较慢的时候就Load不下来），于是刷新了一下，还是不行………………<a href='http://www.daibei.org/gmail%e5%87%ba%e7%8e%b0%e6%95%85%e9%9a%9c%ef%bc%9f.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></description>
			<content:encoded><![CDATA[<p>    今天早上上班之后，像往常一样打开我的邮箱，但是Gmail的显示一直都是Loading，而过了很久都没有加载完毕，以为是网络的问题（以前遇到过这样的情况，网速比较慢的时候就Load不下来），于是刷新了一下，还是不行………………<a href='http://www.daibei.org/gmail%e5%87%ba%e7%8e%b0%e6%95%85%e9%9a%9c%ef%bc%9f.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/gmail%e5%87%ba%e7%8e%b0%e6%95%85%e9%9a%9c%ef%bc%9f.html/feed</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>我的Gmail也更新到了New Version</title>
		<link>http://www.daibei.org/%e6%88%91%e7%9a%84gmail%e4%b9%9f%e6%9b%b4%e6%96%b0%e5%88%b0%e4%ba%86new-version.html</link>
		<comments>http://www.daibei.org/%e6%88%91%e7%9a%84gmail%e4%b9%9f%e6%9b%b4%e6%96%b0%e5%88%b0%e4%ba%86new-version.html#comments</comments>
		<pubDate>Tue, 06 Nov 2007 05:34:37 +0000</pubDate>
		<dc:creator>SunQ</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[Google]]></category>

		<guid isPermaLink="false">http://www.Sun-Q.cn/?p=215</guid>
		<description><![CDATA[<p>今天登陆我的个人邮箱（我的个人邮箱跟工作邮箱是分开的，不过都是Gmail）的时候，忽然发现已经更新到了New Version，不过别人一直说的“速度快了”，我倒是没有感觉出来………………<a href='http://www.daibei.org/%e6%88%91%e7%9a%84gmail%e4%b9%9f%e6%9b%b4%e6%96%b0%e5%88%b0%e4%ba%86new-version.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></description>
			<content:encoded><![CDATA[<p>今天登陆我的个人邮箱（我的个人邮箱跟工作邮箱是分开的，不过都是Gmail）的时候，忽然发现已经更新到了New Version，不过别人一直说的“速度快了”，我倒是没有感觉出来………………<a href='http://www.daibei.org/%e6%88%91%e7%9a%84gmail%e4%b9%9f%e6%9b%b4%e6%96%b0%e5%88%b0%e4%ba%86new-version.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/%e6%88%91%e7%9a%84gmail%e4%b9%9f%e6%9b%b4%e6%96%b0%e5%88%b0%e4%ba%86new-version.html/feed</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Gmail的特权:需要Gmail帐号的Google服务</title>
		<link>http://www.daibei.org/gmail%e7%9a%84%e7%89%b9%e6%9d%83%e9%9c%80%e8%a6%81gmail%e5%b8%90%e5%8f%b7%e7%9a%84google%e6%9c%8d%e5%8a%a1.html</link>
		<comments>http://www.daibei.org/gmail%e7%9a%84%e7%89%b9%e6%9d%83%e9%9c%80%e8%a6%81gmail%e5%b8%90%e5%8f%b7%e7%9a%84google%e6%9c%8d%e5%8a%a1.html#comments</comments>
		<pubDate>Fri, 02 Nov 2007 12:58:27 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[G粉观察]]></category>
		<category><![CDATA[Gmail]]></category>
		<category><![CDATA[Google]]></category>

		<guid isPermaLink="false">http://www.chnhrm.cn/?p=47</guid>
		<description><![CDATA[<p class="date">2006-07-17 14:48…………<a href='http://www.daibei.org/gmail%e7%9a%84%e7%89%b9%e6%9d%83%e9%9c%80%e8%a6%81gmail%e5%b8%90%e5%8f%b7%e7%9a%84google%e6%9c%8d%e5%8a%a1.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></description>
			<content:encoded><![CDATA[<p class="date">2006-07-17 14:48…………<a href='http://www.daibei.org/gmail%e7%9a%84%e7%89%b9%e6%9d%83%e9%9c%80%e8%a6%81gmail%e5%b8%90%e5%8f%b7%e7%9a%84google%e6%9c%8d%e5%8a%a1.html' rel="nofollow">◎◎◎更多内容◎◎◎</a></p>]]></content:encoded>
			<wfw:commentRss>http://www.daibei.org/gmail%e7%9a%84%e7%89%b9%e6%9d%83%e9%9c%80%e8%a6%81gmail%e5%b8%90%e5%8f%b7%e7%9a%84google%e6%9c%8d%e5%8a%a1.html/feed</wfw:commentRss>
		<slash:comments>0</slash:comments>
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