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Howoldis“old”?Theanswerhaschangedovertheyears.TwoHundre...
问题详情:Howoldis“old”?Theanswerhaschangedovertheyears.TwoHundredyearsago,youwereoldat35.Atthebeginningofthe20thcentury,theaveragelifespan(平均寿命)was45.In1950,70-year-oldswerereallyold.Today,ahealth...