rangekeeper

例句：

1. 1. 看守人；2.
   铁路的
2. 3.
   火车的
3. 1.The rangekeeper was responsible for monitoring the security of the area.
   看守人负责监控该区域的安全。
4. 2.The signalman waved his hand to indicate the train should stop.
   信号员挥手示意火车应该停下来。
5. 3. The conductor made sure all passengers were seated before the train departed.
   列车长确保所有乘客都坐好后，列车才出发。