![Usingtoomuchwateror throwing rubbishintoourriversarecle...]( "Usingtoomuchwateror throwing rubbishintoourriversarecle...")
- 問題詳情：Usingtoomuchwateror throwing rubbishintoourriversareclearwaysthathumanscanputourwatersupplyindanger，butwealsoaffectourwatersupplyinlessobviousways.Youmaywonderhowpaving(鋪砌)aroadcanleadtolessusablefreshwater.Amajorpartofthewater weuseevery...
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