The log() function returns the natural logarithm (base E) of a number.

函数的作用是：返回一个数值的自然对数。

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Logs base e (natural logarithms) appear in the calculation of compound interest, and numerous scientific and mathematical applications.

以 e为底的对数（自然对数）出现在复合计算以及大量科学和数学应用程序中。

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e This is just base e, natural logarithm.

减去EXP自然对数中的。

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