birthrate 也作 birth rate
n.(名词)The ratio of total live births to total population in a specified community or area over a specified period of time. The birthrate is often expressed as the number of live births per ,000 of the population per year.Also called natality 出生率:某一特定集团或区域在指定时间段内总出生人口与总人口的比率。出生率常以每年每000人口中的出生人数来表示也作 natality