This is what allows the viewer to control the state of the domain objects, whether they are expanded or collapsed.
这就使查看器能够控制域对象的状态，而不用考虑域对象是否展开或是被破坏。
This is what allows the viewer to control the state of the domain objects, whether they are expanded or collapsed.
这就使查看器能够控制域对象的状态，而不用考虑域对象是否展开或是被破坏。
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