cerastium

例句：

1. 1.The iron was rusted over time.
   铁生锈了。
2. 2.He applied a rust-resistant paint to protect the metal.
   他给金属涂上了防锈漆以保护它。
3. 3. The car's engine has developed a rusty layer on the cylinder head.
   汽车的引擎在气缸头上长出了一层锈。