返回：链表新的首节点。

Returns: the new first node of the list.

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成员节点负责感知和收集信息，发送数据给簇首节点。

Members of the node is responsible for sensing and gathering information, sending data to the cluster head node.

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然后，以基站为树根，各簇首节点根据跳数和能量级别建立层次路由树。

Then, a hierarchical routing tree with base station as the root is established according to the hop and energy-level of.

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