TheUnitedStatesestim的知识精选

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