A user class that abstracts the user in the application.

一个在这个应用软件中选取用户的user类。

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A fallback on a user class causes the compiler to assume the current namespace.

用户类上的后退会让编译器假设使用当前的名称空间。

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This principle asserts that the designer of a class and the user of that class share assumptions about the class implementation.

这个原理声称一个类的设计者和这个类的使用者，共同分享关于类的实现的假设。

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