组播通信有效地节约了网络资源，在无线移动网络环境中引入组播有着非常重要的意义。
Multicast conserves the network resources efficiently, it is significant to provide multicast mechanism in wireless mobile environment.
WHERE子句引入第二个变量 concept并定义与图形匹配的三元组。
The WHERE clause introduces a second variable, concept, and defines triples that are matched against the graph.
组任务中引入了一个全新结构。
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