iron oxide

例句：

1. 1. The steel is made from iron ore and then processed to become the steel.
   这种钢是由铁矿石加工而成的。
2. 2.Iron oxide is a common material used in paints and pigments.
   氧化铁是一种常见的用于油漆和颜料的材料。
3. 3.The iron oxide layer on the surface of the metal protects it from corrosion.
   金属表面的氧化铁层保护它免受腐蚀。