ferrous oxide spots

例句：

1. 1.The iron oxide spots on the surface of the metal are due to the corrosion process.
   金属表面的铁氧化物斑点是由于腐蚀过程造成的。
2. 2. The scientist discovered a new type of iron oxide spot that could be used in solar panels.
   科学家发现了一种新类型的铁氧化物斑点，可以用于太阳能电池板。
3. 3. The iron oxide spots on the walls were caused by the acid rain.
   墙上的铁氧化物斑点是由酸雨引起的。