This is because the actual source code and the variable binding can change, based on the environment or the build time definitions of macros and preprocessor commands.

这是因为实际的源代码和变量绑定可以更改，这是建立在环境或者构建宏预处理程序指令的时间定义的基础上的。

youdao

Each time you start your compiler, the preprocessor is run.

每当你运行编译器时，预处理器就会运行。

youdao

New Term: The preprocessor runs before your compiler each time the compiler is invoked.

新术语：每次调用编译器时，预处理器都会在编译器之前运行。

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