这是一个在文档里移动结点的便捷方法。

This is a convenient way to move nodes around in the document.

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检索该文档的根结点。

Retrieve the document's root element.

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该技术通过为热点数据文档创建副本，把热点结点的过剩负载通过副本转移到轻负载结点上，从而降低热点结点的负载。

By creating replicas for heavy-loaded nodes, we can transfer load to low-loaded nodes. Thus, load for heavy-loaded nodes can be reduced.

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