tirodite

例句：

1. 1. The old car was coveredin a thick layer of rust.
   这辆旧车覆盖着厚厚的一层锈。
2. 2. The metalparts were rusted and needed to bereplaced.
   金属部件生锈了，需要更换。
3. 3. The iron railsare rusted and need tobe painted over.
   铁轨生锈了，需要重新涂漆。