净化 jìnghuà to purify
How to remember 净化: 净 clean + 化 change = to purify.
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How it is used
- 'To purify / cleanse' - physical: 净化空气 (jìnghuà kōngqì) to purify air, 净化水质 to purify water.
- Also figurative/moral: 净化心灵 (jìnghuà xīnlíng) to cleanse the soul, 净化社会风气 to purify social mores.