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研究表明,全球生育率正面临下降趋势

2019-07-27 11:15:30来源:快乐赛车投注_快乐赛车投注网址|网站首页

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    renkoushuliangdexiajiangyehuijianshaotanpaifangheweilekaituogengdierjinxingdesenlinkanfahuodong,yinerrenkoujianshaoduihuanjingyousuobiyi。dansuizherenkouhuisuoshui,shehuinianlingjiegouyehuizhengtilaohua,zheijiangdailaiyanjundetiaozhan。yanjiuzhichu,cong2017nianzhi2100nian,quanqiu5suiyixiaertongdeshuliangjiangcong6.81yixiajiangdao4.01yi,er80suiyishanglaonianrenkoudeshuliangjiangcong1.41yibiaoshengzhi8.66yi。laolinghuadailaiyixiliewenti,runashuirenshuliangjianshao、yanglaoheyiliaowufadedaobaozhang、renmenbunenganshituixiudeng。lundundaxuexueyuandeyibulaxin·abu·bakaer(ibrahim abubakar)jiaoshourenwei,jiusuanzheifenbaogaodeyucezhiyouyibandezhunquexing,jianglaijienayiminyehuichengweisuoyouguojiabixuzuodeshiqing,erbushikezuokebuzuodeshiqing,“kuailesaichetouzhuxuyaoconggenbenshangzhongxinsikaoquanqiuzhengzhi。”(zonghe)



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