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。
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.
然后，它存储一个对PDOM中的单元文件的引用以及对所包含的指令和宏定义的其他引用。
Then, it stores a reference to the unit's file in the PDOM, along with references to the included directives and macro definitions.
在宏加工系统中，建立由宏指令生成的指令格式的那部分宏定义。
In macro process system , that part of macrodefinition which forms instruction format generated by the macroinstruction.
当用宏指令调用定义时，从宏定义的模型语句中产生汇编语言语句。
To produce assembler language statements from the model statements of a macro definition when the definition is called by a macroinstruction.
使用指令可以有条件地处理生成文件，显示错误消息，包括其他生成文件，取消定义宏以及打开或关闭某些选项。
Using directives, you can conditionally process your makefile, display error messages, include other makefiles, undefine a macro, and turn certain options on or off.
使用指令可以有条件地处理生成文件，显示错误消息，包括其他生成文件，取消定义宏以及打开或关闭某些选项。
Using directives, you can conditionally process your makefile, display error messages, include other makefiles, undefine a macro, and turn certain options on or off.
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