refining process

例句：

1. 1. The refining process is crucial for the quality of the oil.
   精炼过程对于油的质量至关重要。
2. 2. The refinery process involves a series of chemical reactions to separate impurities from the crude oil.
   炼油厂的过程涉及一系列化学反应，将原油中的杂质分离出来。
3. 3. The refinery process has greatly improved the efficiency of oil production.
   炼油厂的过程大大提高了石油生产的效率。