thoriate

例句：

1. 1. The old iron gate is covered ina thick layer of rust.
   那把旧铁门上覆盖着厚厚的一层锈。
2. 2. Thecar's engine was rusted outafter years of neglect.
   这辆车的引擎在多年忽视后已经生锈了。
3. 3. The metalsurface has developed a layer of rust overtime.
   金属表面随着时间的推移已经形成了一层锈。