In a typical development project, a number of header files relevant to the project may be included multiple times in different source files, and each header file may itself reference many others.
在典型的开发项目中，有很多与项目相关的头文件可能会在不同的源文件中多次被引入，而且每个头文件本身也可能引用很多其他头文件。
In a typical development project, a number of header files relevant to the project may be included multiple times in different source files, and each header file may itself reference many others.
在典型的开发项目中，有很多与项目相关的头文件可能会在不同的源文件中多次被引入，而且每个头文件本身也可能引用很多其他头文件。
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