信号工

例句：

1. 1. The signalman waved his hand to stop the traffic.
   信号员挥手示意停止交通。
2. 2. Thesignalman was responsible formonitoring the traffic lights.
   信号员负责监控交通灯。
3. 3. Thesignalman had to becareful not to disturb the peaceof the crowd.
   信号员必须小心，以免打扰人群的安宁。