Listing 9 provides the macro definition.
清单9给出宏定义。
Listing 7 shows the macro definition to define math symbols using these functions.
清单7给出的宏定义使用这些函数定义了算术符号。
Listing 10 is what the macro definition for the previous macro invocation might look like (all functions prefixed with webserver: are hypothetical functions provided by the web server).
清单10是前面的宏调用的宏定义(所有带webserver：前缀的函数是web服务器提供的假想函数)。
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