下面是一些实用程序设计目标；每个目标将在下面单独的小节中介绍。

Here are some design goals of utilities; each gets its own section, below.

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实现这一目标的程序设计原则就是要让接口和实现分开。

A design principle that helps achieve that goal is to keep interfaces separate from implementations.

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实现这一目标的程序设计原则就是要让接口和实现分开。

A design principle that helps achieve that goal is to keep interfaces separate from implementations.

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