轴环

例句：

1. 1. The machine needs to be checked for any signs of wear on its bearings.
   这台机器需要检查其轴承是否有磨损的迹象。
2. 2. The car's engine is running smoothly, thanks to the new axle.
   汽车的引擎运行平稳，多亏了新的轴。
3. 3. The scientist used an axle to help him move his heavy equipment around the lab.
   科学家用一个轴帮助他移动实验室里的重型设备。