本文介绍了在软件设计中双向关联规则的基本原则：所有双向关联都必须有一侧定义为逆向关联。在一对多关联中，必须是在多的一侧定义；在多对多关联中，可以任意选择一侧定义，没有区别。
The rules you have to remember are straightforward:
All bi-directional associations need one side as inverse.
In a one-to-many association it has to be the many-side,
In many-to-many association you can pick either side, there is no difference.
All bi-directional associations need one side as inverse.
In a one-to-many association it has to be the many-side,
In many-to-many association you can pick either side, there is no difference.
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