oxide of alumina

例句：

1. 1. The oxide of iron is a common material used in construction.
   氧化铁是一种常见的建筑材料。
2. 2. Oxidation is the process by which matter changes into an oxide.
   氧化是物质转变为氧化物的过程。
3. 3. The oxide layer on the surface of the metal protects it from corrosion.
   金属表面的氧化物层保护它免受腐蚀。