Permic

例句：

1. 1. The iron nail is rusting on the wall.
   这个铁钉正在墙上生锈。
2. 2. He noticed that the paint on the door was starting to rust.
   他注意到门上的油漆开始生锈了。
3. 3. The old car has a lot of rust on its body.
   这辆旧车身上有很多锈。