Population structure is an important category of human capital economics, demography, economics, sociology, environmental and ecological research fields such as an important content.
人口结构是人口学的一个重要范畴，也是人力资本经济学、经济学、社会学、环境学、生态学等领域学科研究的重要内容。
Population structure is an important category of human capital economics, demography, economics, sociology, environmental and ecological research fields such as an important content.
人口结构是人口学的一个重要范畴，也是人力资本经济学、经济学、社会学、环境学、生态学等领域学科研究的重要内容。
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