例句
英语六级真题
Demographers (人口统计学者) 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.
出自-2013年6月阅读原文
柯林斯高阶英汉双解学习词典释义
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N-UNCOUNT
人口学;人口统计学
Demography is the study of the changes in numbers of births, deaths, marriages, and cases of disease in a community over a period of time.