grooved ring

例句：

1. 1. This grooved ring is perfect for holding small objects.
   这个凹槽环非常适合放置小物件。
2. 2. The grooved ring on the table is a great place to store keys.
   桌子上的凹槽环是存放钥匙的好地方。
3. 3. The grooved ring on the door is designed to keep it closed.
   门上的凹槽环设计用来保持门关闭。