double wire semaphore signal

例句：

1. 1. The doublewire semaphore signal is usedto control the flow of traffic.
   双线信号灯用于控制交通流量。
2. 2. The double wiresemaphore signal is an essentialpart of our city's traffic system.
   双线信号灯是我们城市交通系统的重要组成部分。
3. 3.The double wire semaphore signalis designed to improve safety and efficiency intransportation.
   双线信号灯的设计旨在提高运输的安全性和效率。