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目前,世界上越来越多的国家开始重视控制人口增长问题。到1975年止,大约占世界三分之二的国家采取了控制生育的措施,这些国家的人口总数约占世界人口的
At present, more and more countries in the world have begun to attach importance to controlling population growth. By 1975, countries that took about two thirds of the world’s population had taken measures to control their fertility. The total population of these countries accounted for about a third of the world’s population