设置的过程与地面物体的创建相似，只不过需要为动态物体定义额外的一些属性。
This setup is similar to the creation of the ground body, except that you define additional attributes for the dynamic body.
动态关系根据唯一对业务对象进行标识的键属性定义其间的相关性。
A dynamic relationship defines correlations between business objects according to the key attributes that uniquely identify them.
图30还显示了两个提供定义反向链接能力的附加属性，即静态组和动态组如何维护关于其成员的信息。
Figure 30 also shows two Additional Properties that provide the ability to define reverse linkage, which is how groups maintain information about their members, for both static and dynamic groups.
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