炼油

例句：

1. 1.The process of refining oil involves removing impurities from crude oil.
   炼油过程涉及从原油中去除杂质。
2. 2.Refining processes are crucial for producing high-quality petroleum products.
   精炼过程对于生产高质量的石油产品至关重要。
3. 3. The refinery is the heart of the oil industry, where refined oil is produced.
   炼油厂是石油工业的核心，这里生产着精制的石油。