[mass noun]the study of statistics such as births, deaths, income, or the incidence of disease, which illustrate the changing structure of human populations 人口统计学 ■the composition of a particular human population 人口组成(或构成) Europe's demography is changing. 欧洲的人口组成正在发生变化。
派生 demographer noun 语源
late 19th cent.: from Greek dēmos 'the people' + -graphy