ferric casse

例句：

1. 1. The old car's engine is covered in ferric casse.
   这辆旧车的引擎上满是铁锈。
2. 2. The iron door was rusted open by the rain.
   雨水使这扇铁门生锈并打开了。
3. 3. The metal surface has developed a layer of ferric casse due to exposure to the elements.
   由于暴露于元素，金属表面已经形成了一层铁锈。