The research of the factors affecting the number of children has always been an important area of Sociology of Population.

关于影响生育子女数量因素的研究一直是人口社会学的重要领域。

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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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Some problems arising from urban construction such as population expansion and deterioration of environment are problems of both city planning and sociology.

城市建设中诸如人口膨胀、环境恶化等问题，既是城市规划问题，也是社会学问题。

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The Piazza San Marco is timeless, but the sociology of its tourist population has changed markedly, a leading indicator for sure as to the health of Euroland if not the world.

FORBES: Venezia, Still My Favorite Leading Indicator