refine

柯林斯詞典

1. V-T When a substance is refined, it is made pure by having all other substances removed from it. 提煉[usu passive]
Oil is refined to remove naturally occurring impurities. 油經(jīng)過(guò)提煉去除天然生成的雜質(zhì)。
2. refiningN-UNCOUNT 提煉
...oil refining. …煉油。
3. V-T If something such as a process, theory, or machine is refined, it is improved by having small changes made to it. 完善[usu passive]
Surgical techniques are constantly being refined. 外科手術(shù)技術(shù)正在不斷得到完善。