ageing population的用法和样例：
例句
- Japan is facing the pressing issue of a declining birthrate and aging population.
日本正面临着出生率下降和人口老化的压力。 - More important, America's labor supply is growing more slowly as the population ages, the share of women working has leveled off and that of students who work has fallen.
更为重要的是，美国劳动力供给增长速度不及人口老化速度，且劳动力市场女性所占份额趋近平稳，而学生所占份额却有所下滑。
