求翻译：计划生育主要内容及目的是：提倡晚婚、晚育，少生、优生，从而有计划地控制人口。计划生育这一基本国策自制订以来，对中国的人口问题和发展问题的积极作用不可忽视，但计划生育一味的只控制人口数量，忽略世代更替，造成国家严重的老龄化，未富先老的格局。到21世纪初，中国的计划生育政策又做出了一些调整。由于20世纪80年代出生的第一批独生子女已经到达适婚年龄，在许多地区，特别是经济较发达的城市，计划生育政策有一定程度的放松。是什么意思？

Main contents and purpose of family planning are: Advocating delayed marriage and childbearing, fewer and healthier, eugenics, and thus plans to control the population. Since the formulation of the basic national policy of family planning has been on China's population problem and the positive role

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The birth control primary coverage and the goal are: Advocated the

Family planning content and aims to promote late marriage, childbirth, and less health, eugenics, which systematically control the population. The basic national policy of family planning since its formulation, on China's positive role on population issues and development can not be ignored, but fam