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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.
a major work on the demography of preindustrial societies.
一部关于前工业社会人口学的主要著作。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。