system macro-operation statement 系统宏指令操作语句
macro operation symbolic assembler 宏作业符号组译器
macro operation 宏运算
macro-economic operation 宏观经济运行
Listing 2 demonstrates the macro to perform this operation.
清单2演示执行此操作的宏。
More specifically, it will perform the given operation at macro-expansion time, which is not always the same as compile time in Scheme systems.
更具体地说，它是在宏展开时执行给定的操作，在Scheme系统中宏展开与编译并不总是同时进行的。
If the macro can't perform the operation, it provides a warning.
如果宏不能执行指定操作，就会提供警告。
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