elderly population的用法和樣例：
例句
- Unfortunately the elderly population in America is increasing fast.
不幸的是，在美國的老年人口正在增加快。 - While we are happy about the increase in our life expectancy ,it has also resulted in a rapid increase of the elderly population.
我們?yōu)槿嗣耦A期壽命的提高感到高興，但這也帶來(lái)了老年人口迅速增長(cháng)的問(wèn)題。
