locomotive radio-control

例句：

1. 1. The train's locomotive is a marvel of engineering.
   这列火车的机车是工程的奇迹。
2. 2.The engineer had to repair the locomotive before it could start again.
   工程师必须在火车再次启动之前修理好机车。
3. 3.The locomotives were used to transport coal from the mines to the factory.
   这些机车被用来将煤炭从矿井运往工厂。