refining
柯林斯词典
1. V-T When a substance is refined, it is made pure by having all other substances removed from it. 提炼[usu passive]
Oil is refined to remove naturally occurring impurities. 油经过提炼去除天然生成的杂质。
2. refiningN-UNCOUNT 提炼
...oil refining. …炼油。
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. 外科手术技术正在不断得到完善。
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