lock ring at the end of shaft

例句：

1. 1. The lock ring on the door is a crucial component in securing the door.
   门上的锁环是确保门安全的关键部件。
2. 2.The lock ring was designed to prevent unauthorized access to the building.
   锁环的设计是为了阻止未经授权的人员进入建筑。
3. 3.The lock ring was removed to gain access to the locked room.
   为了进入这个被锁的房间，需要移除锁环。