rusted surface

例句：

1. 1. The old car's rusted surface is a testament to its age.
   这辆旧车的生锈表面是它年龄的见证。
2. 2. The metal parts on the engine are rusted and need to be replaced.
   发动机上的金属部件生锈了，需要更换。
3. 3. The paint on the walls has started to rust, indicating that the house needs some maintenance.
   墙上的油漆开始生锈，表明这所房子需要一些维护。