The three levels of abstraction are defined as follows
三个抽象层次定义如下
Contacts are stored in the contacts.cfg file and are defined as follows.
联系人存储在contacts . cfg文件中，并且定义如下。
EA and AM, however, go about attaining this goal in extremely different ways. In the report EA and AM are defined as follows.
然而，EA和AM在达成这个目标时却采用了截然不同的方式。
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