Age structure has aging trend;

年龄结构有老年化趋势；

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。

Age structure may also be represented by a survivorship curve.

存活曲线也可以反映年龄结构.

China's men's small-caliber rifle biased age structure of young athletes;

我国男子步枪小口径项目运动员年龄结构偏年轻；

In this paper we formulate an epidemic model with chronological age and infectious age structure.

本文根据流行病的传染过程和机理建立了具有年龄和病程结构的流行病模型.

The unreasonable phenomena of professional structure acknowledge structure age structure existing in technoledge advisary fields are analyzed.

分析了我国技术咨询业在专业结构、知识结构、年龄结构等方面存在的不合理现象。

Age structure is a foundational base to study the population dynamics.

年龄结构是研究种群动态的重要基础.

In this paper , we study a nonautonomous SIS model with age structure.

研究具有年龄结构的非自治的SIS模型.

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。

From the population age structure, China will be the end of the 20th century, the beginning of the next century into old age society.

从人口年龄构成上看，中国将在20世纪末、下世纪初进入老年型社会。