实际上，它维护树的一个小子集。

In effect, it maintains a small subset of the tree.

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在该网络模型中节点在三种角色之间变化：根节点，分支节点和叶子节点，来组织和维护树型网络结构。

In the network model, Nodes change between the three roles: root node, branch node and leaf node, to organize and maintain the network tree structure.

youdao

在该网络模型中节点在三种角色之间变化：根节点，分支节点和叶子节点，来组织和维护树型网络结构。

In the network model, Nodes change between the three roles: root node, branch node and leaf node, to organize and maintain the network tree structure.

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