铁锈迹

例句：

1. 1. The old car has a lot of rust on its body.
   这辆旧车身上有很多锈。
2. 2. The metal was exposed to the air for too long, causing it to rust.
   金属暴露在空气中太久，导致它生锈。
3. 3. To prevent rust, the paint needs to be regularly reapplied.
   为了预防生锈，需要定期重新涂漆。