| 释义 |
〔birthrate〕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 1,000 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1000人口中的出生人数来表示 也作 natality〔subpopulation〕A part or subdivision of a population, especially one originating from some other population:分组人口：总人口的一部分或分支，尤指从其他人口分出者： |