Increase the ability of correspond by letter, raise the telephone universality rate, take the area trunk line fiber optic cable and the city country telephone nets as the point.
增加通信能力，提高电话普及率，以区际干线光缆和城乡电话网为重点。
2
The system architecture, the project system configuration and the trunk quantity calculation of wireless local telephone campus network are described in combination with a project example.
通过一个工程实例，介绍了无线市话校园网的系统结构、系统配置及中继数量的计算。
3
When by the fifth day there was still no trace of li's metal trunk, li grew so upset that he began yelling and jumping about. After two long distance telephone calls, it finally arrived.