Railroad companies employed thousands of workers to create the smooth, flat pathways required by trains.
铁路公司雇佣成千上万的工人来创建平通路所需的火车。
Can you imagine the individuals who make flat cars and rails and railroad engines and who construct and install the communication systems incidental thereto?
你可以想象一下那些操作平板车、钢轨和机车还有设计和构建交通运输系统的人们吗？
A fault in the wheel flat of a railroad car would threaten the safety of the car.
铁道车辆踏面平轮故障危及列车行车安全。
A fault in the wheel flat of a railroad car would threaten the safety of the car.
铁道车辆踏面平轮故障危及列车行车安全。
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