signal pipe line

例句：

1. 1.The engineer designed a new signal pipe linefor the city's traffic system.
   工程师为城市的交通系统设计了一种新的信号管道线。
2. 2. The construction of the signal pipeline has been completed, and it isnow ready for use.
   信号管道线的施工已经完成，现在可以使用了。
3. 3. Thesignal pipe line plays acrucial role in maintaining the safetyof communication systems.
   信号管道线在维护通信系统的安全性方面起着至关重要的作用。