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demographic factor
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demographic factor
Encyclopedia
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demographic factor
人口因素
作为社会存在和发展的条件之一,人口是指处于一定历史发展阶段上的、由一定数量构成的有生命的个人的总和。人口因素具体包括人口的数量、质量、构成、分布及其变动情况等。
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underground natural gas storage
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underground oil chamber
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