crassamentum

例句：

1. 1.The old iron gate is covered in a thick layer of rust.
   那把旧铁门上覆盖着厚厚的一层锈。
2. 2. The car's engine was rusted out after years of neglect.
   这辆车的引擎在多年忽视后已经生锈了。
3. 3. To prevent rust, it's important to regularly clean and oil the metal surfaces.
   为了防止生锈，定期清洁和润滑金属表面是很重要的。