变量会使用它们表示的值进行计算和替换。

Variables are evaluated and replaced with the value they represent.

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docName 变量表示要搜索的文档。

The docName variable represents the document to search.

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上面显示的缓冲区变量表示实际的 XML 块。

The buffer variable shown above represents an actual XML block.

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This refers to random variables that have fat-tailed distributions-- random variables that occasionally give you really big outcomes.

这就表示,服从长尾分布的随机变量,这些数据出现极端值的概率比较大

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A positive covariance means that the two move together.

一个正值的协方差表示两个变量同向变动

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