NMAKE inherits macro definitions for environment variables that exist before the start of the session.
NMAKE继承在工作阶段开始之前就存在的环境变数巨集定义。
Macros maintain the value of their variables between executions of the macro, but not between sessions of the integrated development environment (IDE).
宏在宏执行之间保持它们的变量值，但不在集成开发环境(IDE)的会话之间保持变量值。
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