| 词汇 | demographer | 
| 释义 | demographer  noun [ C ] uk/dɪˈmɒɡ.rə.fər/ us/dɪˈmɑː.ɡrə.fɚ/  人口统计学家 a person who studies changes in numbers of births, marriages, deaths, etc. in an area over a period of time | 
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