Global symbols in a mapfile usually have one or more leading underscores because the compiler adds a leading underscore to variable names.
映射文件中的全局符号通常有一个或多个前导下划线，因为编译器向变量名添加前导下划线。
Global symbols in a mapfile usually have one or more leading underscores because the compiler adds a leading underscore to variable names.
映射文件中的全局符号通常有一个或多个前导下划线，因为编译器向变量名添加前导下划线。
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