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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You need to have base machine images for the various roles (web server, E-mail server, database server, and so on) and to use tools like Chef or Puppet to automatically configure instances.

您需要有适用于各种角色(Web服务器、电子邮件服务器、数据库服务器等)的基础机器映像，并使用工具(如Chef或Puppet)来自动化配置实例。

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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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