Shown here are a quick-change tooling system based on a standard square-shank lathe toolholder (right), as well as a cross-section of a coated PCBN insert (left).

此处显示的是一个快速更换刀具系统，它建立在一个标准的方形支柱车床刀架(右)上，还显示了一个PCBN涂层刀片的横截面(左)。

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Once you have created a dictionary, you can access its values using the standard square-bracket indexing notation, but using a string as the index instead of a number.

一旦完成了创建字典，您就可以使用标准方括号索引符号来访问它的值，但是要使用字符串作为索引而不是一个数字。

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Just 200, 000 square feet of companies racing to fill their share of the world's billions of standard sockets-and betting on LEDs as the way to do it.

占地几乎200,000平方英尺大的许多家公司竞争着填补世界上数亿计的灯口插座。他们大多以led技术作为制胜手段。

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Because the square root of 10,000 is 100, whatever the standard deviation of the portfolio is, you would divide it by 100 and it would become really small.

因为一万的平方根是一百，无论这个投资组合的标准差是多大，当除以100后就都变得很小很小了。

耶鲁公开课 - 金融市场课程节选

The standard deviation is the square root of the variance.

标准差是方差的平方根

耶鲁公开课 - 金融市场课程节选

What we want to do now is compute the mean and variance of the portfolio-- or the mean and standard deviation, since standard deviation is the square root of the variance-- for different combinations of the portfolios.

我们现在要做的是,计算这个投资组合的均值和方差-,或者均值和标准差，因为标准差的平方就等于方差-,这对任何投资组合都是一样的。

耶鲁公开课 - 金融市场课程节选

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