Usingtoomuchwateror throwing rubbishintoourriversarecle...
问题详情：Usingtoomuchwateror throwing rubbishintoourriversareclearwaysthathumanscanputourwatersupplyindanger，butwealsoaffectourwatersupplyinlessobviousways.Youmaywonderhowpaving(铺砌)aroadcanleadtoles...