You must design the topic tree such that each copy of the message flow can serve a particular topic or portion of the tree.

您必须对主题树进行相应的设计，以使消息流的每个副本可以服务于一个特定的主题或树中特定的部分。

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This method removes the need to manually copy the unchanged portions of the syntax tree.

这个方法让我们不需要手动复制语法树中没有变更的部分。

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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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