demographic evolution The gradual pattern of change in the growth of human populations in a particular region or country, from a rapid increase in the birth and death rates to a leveling off in the growth rate due to reduced fertility and other factors(在特定国家或区域中人口成长的变化趋势，由快速增加的出生率与死亡率到因生育减低与其他因素影响下，成长率趋缓持平的过程。)
