lithomarge

例句：

1. 1. The old iron door is covered in a thick layer of rust.
   这扇旧铁门上覆盖着厚厚的一层锈。
2. 2. The rusty nail was difficult to remove from the wall.
   生锈的钉子很难从墙上拔下来。
3. 3. He noticed that the paint on the car had started to rust.
   他注意到汽车上的油漆开始生锈了。