age structure of population 种群的年龄结构 ; 人口年龄结构 ; 人口年龄构成
Such a policy distorts the age structure: the proportion of population in the younger age groups goes down and proportion of the elderly increases.
这样一项政策改变了年龄结构：年轻人的人口比例下降，而老年人的比例增长。
Simply introduce the concepts of the population age structure.
简单介绍有关人口年龄结构的相关概念。
At the same time of population census, the age structure of wintering common cranes had also been examined.
在进行种群数量调查的同时，还对越冬灰鹤种群的年龄结构进行了探讨。
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