铁环

例句：

1. 1. The iron ring on the fence was rusted and needed to be replaced.
   围栏上的铁环生锈了，需要更换。
2. 2. The children were playing with their new iron rings.
   孩子们正在用他们的新铁环玩耍。
3. 3. The old iron ring had been replaced by a new one.
   旧的铁环已经被新的替换了。