rear axle shaft key

例句：

1. 1. The rear axle shaft is the part that connects the rear wheels to the engine.
   后轴轴是连接后轮和发动机的部分。
2. 2.The rear axle shaft bolt was loose and needed tightening.
   后轴轴螺栓松动了，需要拧紧。
3. 3.The rear axle shaft nut is used to secure the axle shaft in place.
   后轴轴螺母用于将轴轴固定到位。