When designing a header it is essential to remember the difference between definitions, which may only occur once, and declarations, which may occur multiple times (Section 2.3.5, p. 52).

当设计头文件时，记住定义和声明的区别是很重要的。定义只可以出现一次，而声明则可以出现多次(第2.3.5节)。

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When designing a header it is essential to remember the difference between definitions, which may only occur once, and declarations, which may occur multiple times (Section 2.3.5, p. 52).

当设计头文件时，记住定义和声明的区别是很重要的。定义只可以出现一次，而声明则可以出现多次(第2.3.5节)。

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