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。
Describes prohibited edits of conditional compilation directives.
说明条件式编译指示词所禁止的编辑。
These conditional compilation directives can "hide" code by turning off the emission of debug symbols and resetting the line position.
这些条件式编译指示词可以“隐藏”程序码，方法为关闭侦错符号的发出并重设行位置。
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