demographers

Demographers reckon that three-quarters of humanity could be city-dwelling by 2050, with most of the increase coming in the fast-growing towns of Asia and Africa.

人口统计学家估计,到2050年,城市居民可能会占总人口的四分之三,其中大部分增长来自亚洲和非洲快速发展的城镇。

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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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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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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 talk about a " low-fertility trap "

人口学家称之为 “ 低生育陷阱 ”

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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 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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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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In 2002, James Vaupel of the Max Planck Institute for Demographic Research in Rostock, Germany, startled demographers by pointing out that every estimate published of the level at which average life expectancy would level out has been broken within a few years.

2002年，德国罗斯托克马克斯-普朗克人口研究所（Max Planck Institute for Demographic Research）的詹姆斯•沃佩尔（James Vaupel）指出，每次公开发布的对平均寿命趋稳水平的估计都会在几年内被打破，这令人口统计学家感到吃惊。

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