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.
开发周期中途更改活动很可能会引入一组新的动力到项目。
Changing activities midway through the development cycle could easily introduce a new set of dynamics to the project.
组任务中引入了一个全新结构。
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