This is also made possible by the use of three failure groups, which are further explained under Data replication.

这是通过使用三个故障组得以实现的，我们将在数据复制一节详细对之进行介绍。

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Setting up of a different replication topology under a base that already has replication set up can be quite tedious.

在已经设置了复制的条目基下面设置不同的复制拓扑很麻烦。

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A forwarding layer maps ranges of source IDs to physical databases, and replication is handled by building a tree of such tables under the same forwarding address.

该层将一段源id映射到物理数据库，对于同一个物理地址的表，通过建立树来处理。

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