网格划分完成后，每个网格选举一个节点作为群首，群首可以对网格内节点进行管理，并具有路由转发功能。
When grid is formed, every grid has a gateway. The grid gateway could manage the nodes in the grid, route and transfer packets.
网格划分完成后，每个网格选举一个节点作为群首，群首可以对网格内节点进行管理，并具有路由转发功能。
When grid is formed, every grid has a gateway. The grid gateway could manage the nodes in the grid, route and transfer packets.
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