proportion of old population

• n. 老龄人口比重

例句

用作名词 (n.)

1. The proportion of regular smokers increases with age.
   习惯吸烟的人口比重随年龄的增长而上升。
2. China's population continues to grow,the proportion of the aged is getting larger,and the pressure on employment and social security is mounting.
   人口总量继续增加，老龄人口比重上升，就业和社会保障压力增大。