汇编程序采用的一种动作，例如在宏定义展开时，它用一个值来代替一个变量符号。
The action taken by the assembler when it replaces a variable symbol with a value , for example , during the expansion of a macro definition.
汇编程序采用的一种动作，例如在宏定义展开时，它用一个值来代替一个变量符号。
The action taken by the assembler when it replaces a variable symbol with a value , for example , during the expansion of a macro definition.
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