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Hundredsofyearsago,lifewasharderthanitistoday.People...
问题详情: Hundredsofyearsago,lifewasharderthanitistoday.Peopledidn’thavemodernmachines.Therewasnomodernmedicine,either.Lifetodayhasbroughtnewproblems.Oneofthebiggestispollution.Waterpollutionhasm...