程序包含一个工程文件和两个单元文件。

The program includes a project file and two new unit files.

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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.

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当你编译的程序使用了其它单元文件。编译器会在本目录搜索源文件和已编译单元。

When you compile a program that USES units, the command-line compiler searches for source and compiled unit files in the current directory.

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