The copied tree is made a slave of the root tree so that mount actions in the root tree are propagated to the copy but not the other way around.
这个复制的树是根树的从属挂载，所以根树中的挂载活动会传播到这个拷贝，但是不会反向传播。
The copied tree is made a slave of the root tree so that mount actions in the root tree are propagated to the copy but not the other way around.
这个复制的树是根树的从属挂载，所以根树中的挂载活动会传播到这个拷贝，但是不会反向传播。
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