求翻译：第一代模拟集群通信系统从1987年开始投入商用。多频道集群通信系统的控制器由几个信道形成一群自动搜索可用信道给用户使用。因此，多频道集群通信系统平均每频道可提供的用户数较多且效率也有所提高。是什么意思？

The first generation of analog radio communications system in commercial use since 1987. Multi-channel trunking system controller to form a group by the number of channels automatically search for available channels to users. Therefore, the multi-channel radio communications system for each channel

The first-generation analog Trunked communications system starting from 1987 available for commercial use. Multi-channel clustering in the communication system controller is composed of several channel formed a group to automatically search for available channel users. Therefore, multi-channel clust

The first generation of simulation colony communications system started from 1987 to invest commercial.The multi-channel colony communications system controller forms a crowd of automatic scan available channel by several channels to the user the use.Therefore, multi-channel colony communication

First generation analog trunking communication system from 1987 into commercial. Multi-channel trunking system controller automatically searches for available channels to several channels formed by a group of users. Therefore, multichannel trunking communication system for every channel can be provi