lubrication ring

例句：

1. 1. The machine's lubrication ring is worn out, and it needs to be replaced.
   这台机器的润滑环磨损了，需要更换。
2. 2.The technician carefully inspected the lubrication ring before starting the engine.
   技师在启动发动机前仔细检查了润滑环。
3. 3.The lubrication ring plays a crucial role in preventing friction and wear on the moving parts of the machine.
   润滑环在防止机器移动部件摩擦和磨损中起着关键作用。