semaphore repeater

例句：

1. 1.The traffic police used a semaphore repeater to control the flow of traffic.
   交通警察使用信号灯重放器来控制交通流量。
2. 2. The semaphore repeater was essential for maintaining safety during construction operations.
   信号灯重放器对于维护施工作业的安全至关重要。
3. 3.The engineer designed a new type of semaphore repeater that could provide better signal coverage.
   工程师设计了一种新型的信号灯重放器，能够提供更好的信号覆盖范围。