working-age population的用法和样例：
例句
- A widening age gap exists between the older populations in the West and the large working-age populations in developing countries.
在西方国家的老年人口和发展中国家大的工作年龄人口之间存在宽的年龄缺口。 - As birth rates decline, the proportion of children shrinks and the working-age population bulges, as is happening now in Africa.
因为生育率下降，儿童比例减小，而劳动年龄人口却激增，非洲当前正是如此。
