Obviously, the rural population structure is a Compound system in general.
可见，农村人口结构是一个广义上的复合系统。
Based on the current population structure, that trend will not change in the short term.
基于目前的人口结构情况，这一趋势在短时间内不会改变。
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。
Of course, the division of population age structure is comparative, but not invariable.
当然，对人口年龄结构的划分是相对的，而不是一成不变的。
Also speculate about the current age structure of the elephant population.
并且推测这个大象群落的当前年龄结构。
Age Structure Change of World Population.
全球人口年龄结构变迁。
Age Structure Change of World Population.
全球人口年龄结构变迁。
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