purify
verb [ T ] uk/ˈpjʊə.rɪ.faɪ/ us/ˈpjʊr.ə.faɪ/
(NOT MIXED)
使纯净，净化
to remove bad substances from something to make it pure
Plants help to purify the air. 植物有助于净化空气。
One of the functions of the kidneys is to purify the blood. 肾脏的功能之一是净化血液。
water-purifying tablets 净水片剂
(MORALLY GOOD)
净化思想（或行为）
to remove immoral thoughts or acts from something
One of the main teachings of Buddhism is that you should try to purify your mind. 佛教的主要教义之一是人应该努力净化自己的思想。