purify [ˈpjʊərɪfaɪ]

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vt.使纯净，提纯，使纯洁

to remove bad substances from something to make it pure

They open the windows to purify the air of the room. 他们打开窗户清涤室内空气。
You should purify the water before drinking it. 喝水前，你应使之净化。