refine

1. V-T When a substance is refined, it is made pure by having all other substances removed from it. 提鍊[usu passive]

Oil is refined to remove naturally occurring impurities. 油經過提鍊去除天然生成的襍質。

2. refiningN-UNCOUNT 提鍊

...oil refining. …鍊油。

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. 外科手術技術正在不斷得到完善。