A % beginmacro directive is followed by the macro name.

beginmacro指令后面是宏的名称。

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A.macro directive is followed by a macro name, which may or may not have arguments.

macro指令后面跟着宏名称，后面可以有参数，也可以没有参数。

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After the macro name comes a count, the number of macro arguments the macro is supposed to have.

宏名称后面是一个数字，这是这个宏需要的宏参数数量。

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