人口与经济问题是人类社会长期关注的问题之一，也是人口经济学最重要的研究内容。
The problem of population and economy is one of the long term problems noticed by human society and is the most important research contents of population economics.
人口与经济问题是人类社会长期关注的问题之一，也是人口经济学最重要的研究内容。
The problem of population and economy is one of the long term problems noticed by human society and is the most important research contents of population economics.
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