preoxidized

例句：

1. 1. The steel was preoxidized before being sent to the factory.
   钢材在送往工厂之前进行了预氧化处理。
2. 2. The paint was preoxidized to improve its durability.
   油漆被预氧化以增强其耐用性。
3. 3.The process of preoxidizing iron ore is crucial for the production of steel.
   铁矿石的预氧化过程对于钢铁生产至关重要。