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TheUnitedStatesestimatesthataboutoneoutofevery10peop...
问题详情: TheUnitedStatesestimatesthataboutoneoutofevery10peopleontheplanettodayisatleast60yearsold.By2050,it’sprojectedtobeoneoutof5.Thismeansthatnotonlywilltherebemoreoldpeople,buttherewillbere...