The partition group labeled IBMTEMPGROUP spans across the administration node and the two data nodes.
标有ibmtempgroup的分区组横跨管理节点及两个数据节点。
The Group To List projection can only apply to a group node (see the definition in the data model section) and it turns the group into a list of size one.
Group To List 映射仅可应用于一个组节点（参见数据模型部分的定义），它将组转化为一个单一尺寸列表。
The use of group head rotation mechanism, node with more energy reserves and the optimal location forward packets to other nodes, node with less energy reserves is responsible for data acquisition.
采用组头轮换机制，使能量储备较多和位置最优的节点担任组播节点承担转发任务，能量储备较少的节点负责数据采集任务。
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