axle stop key

例句：

1. 1. The car's engine is running smoothly with the proper axle stop key installed.
   汽车的发动机安装好了合适的轴止键后运行顺畅。
2. 2. The mechanic replaced the old axle stop key with a new one.
   技师用一个新的轴止键替换了旧的。
3. 3. The axle stop key prevents the wheel from spinning freely when the vehicle is in motion.
   轴止键在车辆运动时防止轮子自由旋转。