FormostAmericans,acleanglassofwaterisjustamatterofturni...
问题详情：FormostAmericans,acleanglassofwaterisjustamatterofturningonafaucet（水龙头）.Butformanyoftheworld’spoorest,it’shardtoget. OnWednesday,theUnitedNations(UN)markedWorldWaterDaybytryingto...