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。
The variation of age structure is an important factor to affect the economy.
人口年龄结构的变动是影响经济的重要因素。
The age structure of M. skinneriana is stationary.
野含笑种群的年龄结构属稳定型。
And the age-structure of sport talents is appropriate.
体育人才整体年龄结构较为合理。
The buds were also of increasing age structure.
均呈增长型年龄结构。
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。
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。
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