该树提供了它自己本身、树专用的接口，而且每个节点都是其子节点的一个STL兼容序列。
The tree provides its own, tree-specific interface, and each node is also an STL-compatible Sequence for its child nodes.
该树提供了它自己本身、树专用的接口，而且每个节点都是其子节点的一个STL兼容序列。
The tree provides its own, tree-specific interface, and each node is also an STL-compatible Sequence for its child nodes.
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