life expectancies短语¹³¹⁶²⁰⁺³ 基本例句 na.预期寿命原型lifeexpectancy的复数 And over the next two decades people above60 will form the fastest-growing age group, rising from7% to12% of the population, as fertility rates fall and life expectancies rise. 而且在接下来的二十年间,随着生育率的下降和预期寿命的上升,60岁以上人口的比例将从7%涨到12%,成为增长最迅速的年龄层。 ecocn