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Theworldisnotonlyhungrybutalsothirstyforwater.Thismayse...
问题详情:Theworldisnotonlyhungrybutalsothirstyforwater.Thismayseemstrangetoyou,sincenearly70%oftheearth'ssurfaceiscoveredwithwater.Butabout97%ofthatisseawaterorsaltwater.Mancanonlydrinkandusetheother3...