嵌环

例句：

1. 1. The tree is surrounded by a circle of flowers.
   这棵树被一圈花包围着。
2. 2. He wore a ring on his finger.
   他戴在手指上的戒指。
3. 3. The moon is an excellent example of a natural ring.
   月亮是自然界中一个极好的环形物的例子。