arc eroded metal

例句：

1. 1. The old bridge was made of arc-eroded metal.
   这座老桥是由弧形磨损金属制成的。
2. 2. The car's body is made of arc-eroded metal.
   这辆车的车身是由弧形磨损金属制成的。
3. 3. The arc-eroded metal on the roof has been repaired.
   屋顶上的弧形磨损金属已经被修复了。