重 点

refine

/rɪˈfaɪn/
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。

re(重新) + fine(纯的, 精美的) → 重新变纯 → 精炼
单词造句: