提炼, 精炼
remove impurities or unwanted elements from (a substance), typically as part of an industrial process.
:
• The company uses advanced techniques to refine crude oil.
该公司采用先进技术提炼原油。
• Sugar is refined to remove molasses and other impurities.
糖经过精炼以去除糖蜜和其他杂质。