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IntroductionMandirtiestheairwithgasandsmoke ,poisonsthewaterwithchemicalsandothersubstances,anddamagesthesoilwithtoomanyfertilizersandpesticides .Peopleruintheearth’snaturalbeautybyscatteringjunkandlitteronthelandandinthewater.Thebadlypollutedaircancaus… 相似文献
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