求翻译：无线对讲机尽管有很多问题，但其通信方式（即PTT呼叫方式）深受专业通信用户的青睐。随着通信向网络化、系统化方向的发展，在70~80年代，出现了由单频道、单基地台构成的模拟通信系统，这种通信系统只能提供语音通信功能，适合小范围的专业部门使用。是什么意思？

Walkie-talkies despite many problems, but its means of communication (ie, PTT call mode) communications by professional users of all ages. With communications to the network, the direction of the development of systematic, in the 1970s and 1980s, there has been by a single channel, single base stati

Wireless intercom despite the many problems, but their forms of communication (i.e. , PTT ) Call manner by professional communication favored by the customers. With communications to network, systems development, in the direction of 70 ~ 80 s, a single base station from a single channel, and constit