trolley-bus motor

例句：

1. 1. The new trolley-bus is a great addition to the city's transportation system.
   新的有轨电车是城市交通系统的一大补充。
2. 2. The trolley-bus motor is responsible for powering the vehicle's movement.
   有轨电车发动机负责驱动车辆的运动。
3. 3. The engineers are working on improving the efficiency of the trolley-bus motor.
   工程师们正在努力提高有轨电车的发动机效率。