Demographers call this evolution the demographictransition.
人口统计学家称这种演化为人口过渡。
Some Chinese demographers worry that the country will get old before getting rich.
一些中国人口专家担忧届时可能面临未富先老的问题。
Until recently most discussion in China has been confined to academic demographers.
直到最近，在中国大多数的讨论一直局限于人口统计学家的学术性研讨上面。
Demographers forecast that Memphis will soon become the nation's first majority black metropolitan region.
人口学家曾预言，孟菲斯将成为全国第一个以黑人为主的都市地区。
Demographers forecast that Memphis will soon become the nation's first majority black metropolitan region.
人口学家曾预言，孟菲斯将成为全国第一个以黑人为主的都市地区。
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