loudspeaking telephone set

例句：

1. 1.This loudspeaking telephone set is very convenient for us to communicate with each other.
   这个扩音电话系统对于我们彼此交流非常方便。
2. 2.The loudspeaking telephone set was invented by Alexander Graham Bell in 1876.
   扩音电话系统是由亚历山大·格拉汉姆·贝尔在1876年发明的。
3. 3.The loudspeaking telephone set has become an essential tool for communication in modern society.
   扩音电话系统已经成为现代社会沟通的重要工具。