Unit 12
Mobile Communication
Text  A Global Systems for Mobile Communications   
Unit 12
原文： In the early 1980s, many countries in Europe witnessed a rapid expansion of analog cellular telephone systems. However, each country developed its own system, and interoperability across borders became a limiting factor.
译文: 在20世纪80年代初，欧洲许多国家目睹了模拟蜂窝快速扩张电话系统。然而，每个国家都制订了自己体系，和互操边界成为一个限制原因。
Unit 12
原文:In 1982, the Conference of European Post and Telecommunications (CEPT), an association of telephone and  ...