rust quality

例句：

1. 1. The old car's rusty exterior is a testament to its age.
   这辆旧车的锈迹斑斑的外表是它年龄的见证。
2. 2. The rust quality of the metal has deteriorated over time.
   金属的锈蚀质量随时间恶化。
3. 3.The rust quality of the paint on the walls was unsightly and needed to be repaired.
   墙上油漆的锈蚀质量令人不悦，需要修复。