axle hung traction motor

例句：

1. 1. The car's axle broke, and it won't start again.
   汽车的轴断了，再也启动不了了。
2. 2. The old tree had to be cut down because its axle was rotten.
   那棵老树因为轴已经腐烂不得不砍掉。
3. 3. The train's axle is the only thing holding it together.
   火车的轴是支撑它的唯一东西。