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babybust
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理学
人口统计学
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babybust
少子化
一个社会中随着人口总和生育率下降,少年儿童(0-14岁)占总人口比重降低的现象。一般将一个国家的总和生育率长时间低于维持人口长期稳定发展的更替水平(2.1),界定为少子化。
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configuration-related
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