1. Sodium sulfite is commonly used as a deoxidant in water treatment to remove dissolved oxygen.
亚硫酸钠常常被用作水处理中的除氧剂，以去除溶解的氧气。

2. The deoxidant is added to the molten metal to prevent oxidation during the casting process.
在熔融金属中添加除氧剂，可以防止在铸造过程中的氧化。