It focuses on the proportion or percentage of older people in relation to the total population, rather than the absolute quantity or number of young people.它侧重于老年人占总人口的比例或百分比,而不是年轻人的绝对数量或数量。
再过20年,现在40岁的这批人都老了,而如果没有相应比例的年青人,无法支付现在40岁这批人的养老金。(或许机器人和人工智能的应用能够创造出足够的财富来供养那时的老人)In another 20 years, the group of 40-year-olds will be old, and if there is no corresponding proportion of young people, the pensions of the 40-year-old group will not be able to be paid. (Perhaps the application of robots and artificial intelligence can create enough wealth to support the elderly at that time)