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有些人认为应该净化电视节目
yǒuxiērén rènwéi yīnggāi jìnghuà diànshìjiémù
some people think that television should be cleaned up
用过滤法净化空气
yòng guòlǜ fǎ jìnghuà kōngqì
purify air by filtration
净化系统
jìnghuàxìtǒng
purification system
污水净化
wūshuǐ jìnghuà
sewage purification
