复制方法的可选参数确定如何复制关系和子单元。
Optional parameters to a copy method determine how relationships and sub-elements are copied.
目前，许多房地产产品同质化非常严重，这是一个伟大的复制关系。
At present, many real estate Products homogenization very serious, which is copied from a great relationship with each other.
这种关系是在初始同步期间和启动复制集的时候维护的。
This relationship is maintained during initial synchronization and when starting the replicate set.
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