简介：WithcomparisonofdemographicchangesbetweenthedevelopedEuropeancountriesandChina,thispaperhasdiscussedtheshortcomingsoftheWesterndemographictransitiontheories.Furthermore,thepaperhasproposedthedirectionofdemographictransitionandthecriteriaofsuchtransition'scompletion.Withtheestablishmentofage-structuretransitiontheory,andhelpedwithstrictdefinitionsofbothsurpluspopulationandappropriatepopulation,thepaperpointsoutthedistinctionofdemographicage-structurebetweenthosedevelopingcountriesthatareundergoingdemographictransitionandthosedevelopedcountrieswithanearcompletionofsuchdemographictransition.FinallyitconcludesthatChina'stransitionofagestructureismovingtowardsafeasibledirection.
简介：Inrecentyears,discussiononurbancapacityhasgraduallybeenextendedtothegovernmentandthemasseswhenproblemsliketrafficjams,housingprices,difficultyingettingschoolingandmedicaltreatmentbegintoappearinmegalopolislikeBeijing,ShanghaiandGuangzhou.OnSeptember2,2012,BeijingMunicipalGovernmentandChineseAcademyofSocialSciencessignedanagreementtojointlybuildtheMegalopolisResearchInstituteforEconomicand
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