Female turtles have also become smaller on average; bigger individuals have been removed from the wild population and the overall life expectancy of the species has fallen.
雌龟的平均体型变小了；较大的个体已经从野生种群中消失，并且整个物种的预期寿命都已经下降。
The retiring age is determined by the average life span of population of the whole country and the conditions of labors supply and demand.
退休年龄由各国各地人口的平均寿命以及劳动力供求状况所决定，它对养老金的支付有重要影响作用。
With the fertility reducing and the average life span increasing, There appears population aging trend in Korea.
随着近几十年生育率的持续下降及平均寿命的不断提高，韩国人口逐渐出现了老龄化趋势。
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