sarcophaga

例句：

1. 1.The old car has a lot of sarcophaga on its body.
   这辆旧车身上有很多铁锈。
2. 2.The metal was badly corroded by the acid.
   金属被酸严重腐蚀了。
3. 3. The rust on the metal is visible under a microscope.
   金属上的锈在显微镜下是可见的。