demographic model人口统计学: demography模型: model; pattern人口统计学: demographics; demography and population studies; human demography人口统计学的: demographic人口统计学家: demographer下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:人口统计学模型,即可在微信中查询翻译