refining of petroleum product

例句：

1. 1.The oil is refined to remove impurities.
   该油经过精炼以去除杂质。
2. 2. Refining processes are essential for the production of high-quality petroleum products.
   精炼过程对于生产高质量石油产品至关重要。
3. 3.The refinery produces a variety of petroleum products, including gasoline and diesel.
   炼油厂生产各种石油产品，包括汽油和柴油。