One-Child Rule, fastest-aging population, lowest fertility rates, in China. 獨生子女政策, 最快的人口老齡化, 生育率最低

Wang Zhao/Agence France-Presse — Getty Images
Parents in Shanghai are signaling that, for many of them, one child is enough.
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In Shanghai, Easing of One-Child Rule Isn’t Seen as Cure for Challenges Ahead - 纽约时报中文网 国际纵览
上海呼籲生二胎，或仍難解老齡危機
http://cn.nytimes.com/china/20150130/c30shanghai/en-us/

Population ageing - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Population_ageing
人口老齡化 - 維基百科，自由的百科全書
人口老齡化又稱人口老化或人口高齡化
http://zh.wikipedia.org/wiki/%E4%BA%BA%E5%8F%A3%E8%80%81%E9%BE%84%E5%8C%96
fertility rate是什么意思_fertility rate的翻译_音标_读音_用法_例句_爱词霸在线词典
n.人口出生率，生育率
http://www.iciba.com/fertility%20rate
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