Directives to the output, at the beginning and end of each included file and around lines removed by preprocessor directives for conditional compilation.
指令添加到输出中，位于每个包含文件的开头和结尾以及被条件编译预处理器指令移除的行的周围。
In the process, all preprocessor directives are carried out, macro expansions are performed, and comments are removed.
在此过程中，执行所有的预处理器指令，执行宏展开，并移除注释。
In the process, all preprocessor directives are carried out, macro expansions are performed, and comments are removed.
在此过程中，执行所有的预处理器指令，执行宏展开，并移除注释。
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