flanged ring

例句：

1. 1. The flanged ring on the door is a crucial part of the lock.
   门上的凸缘环是锁的关键部分。
2. 2. The flanged ring on the bolt was damaged during installation.
   螺栓上的凸缘环在安装过程中受损。
3. 3.The flanged ring on the hinge is responsible for keeping the door closed securely.
   铰链上的凸缘环负责确保门安全关闭。