relay automatic telephone system

例句：

1. 1. The relay stationis responsible for transmitting signals from oneend to the other.
   中继站负责将信号从一个端点传输到另一个端点。
2. 2. The relay station was built toimprove the signal strength between two cities.
   中继站的建立是为了提高两个城市之间的信号强度。
3. 3. The relay station is acrucial component in the communication system.
   中继站是通信系统中的一个关键组成部分。