重要

refine

/rɪˈfaɪn/VCE📚 6701 49 1四级六级考研托福雅思
When a substance is refined, it is made pure by having all other substances removed from it. 提炼

verb [vt. 及物动词]精炼,提纯;改进,改善;使…文雅

Oil is refined to remove naturally occurring impurities. 油经过提炼去除天然生成的杂质。

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