railway motor car

例句：

1. 1. The railway motorcar is a crucial part of the transportationsystem.
   铁路机车车辆是交通系统的重要组成部分。
2. 2. Theengineers are responsible for maintaining the safetyand efficiency of the railway motor cars.
   工程师们负责维护铁路机车车辆的安全和效率。
3. 3.The railway motor car was designed to transportpassengers and goods efficiently.
   铁路机车车辆被设计用来高效地运输乘客和货物。