Selectivity of human migration long been the focus of demographers and economists.
人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点.
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In the public's eyes , demographers have a checkered reputation.
民众对人口统计学者的评价不一.
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Demographers talk about a " low - fertility trap "
人口学家称之为 “ 低生育陷阱 ”
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Demographers reckon that at least three - quarters of Egyptians actually live in urban areas.
人口统计学家认为,至少有四分之三的埃及人实际上是生活在城市.
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Demographers say a rate of 2.1 is needed to keep a population from declining.
人口统计学家指出,生育率必须达到2.1,才能防止人口减少.
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Selectivity of human migration has long been the focus of demographers and economists.
摘要人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点.
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Demographers have calculated that the world's population will double by the end of the twentieth century.
人口统计学家推算到了二十世纪末世界人口会加倍.
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