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Usingtoomuchwaterorthrowingrubbishintoourriversareclear...
問題詳情：Usingtoomuchwaterorthrowingrubbishintoourriversareclearwaysthathumanscanputourwatersupplyindanger,butwealsoaffectourwatersupplyinlessobviousways.Youmaywonderhowpaving(鋪砌)aroadcanleadtolessus...
