As a weak group, the old age group is the special part of social population structures, and need to be protected particularly.
老年群体是社会人口结构中的特殊部分，处于弱势地位，需要给予特殊保护。
Results the spatial semivariogram model revealed the spatial genetic structures of a human population.
结果实例表明，模型客观地反映了人类群体遗传空间结构异质性和空间自相关性。
The different population structures of Abies yuanbaoshanensis in different associations reflected the process of succession of community.
元宝山冷杉不同群丛元宝山冷杉种群结构的差异反映了群落的演替过程。
On the base of main modes of spatial relation and spatial structures for population in Metropolitan Area in developed countries, the common and different points are concluded.
在全面介绍了国外有关大都市圈空间联系和人口空间结构变化的一般模式基础上，归纳了各模式的共性及其差异。
The spawning times, absolute fecundities, age structures of breeding population, and spawning types of fish were also studied.
测定分析鱼类生殖力、产卵期、繁殖群体的年龄结构及产卵类型。
To study regional average stress field, we need to choose a population of focal mechanism solutions of earthquakes in the massifs where there are significant tectonic structures.
选择具有地震构造意义的地块或地震带内大量地震的震源机制解研究区域平均应力场。
The population structures vary with time and site.
种群结构因时间、地点而异。
The influx of immigrants into Canada in the 1990s has brought not only an important impact on its economy, but also the changes in its population and ethnic structures.
20世纪大批移民涌入加拿大，他们对加拿大的经济产生了重大影响，也带来了人口的变化和加拿大民族结构的改变。
The electron population and vibrational mode analysis were carried out to study their unique structures.
具有特殊的结构，用电子布居分析和振动模式分析来研究这种特殊结构。
The time specific life table, survivorship curve and age structure of Cathaya argyrophylla population were obtained through analysing the demography and age structures of its main coenopopulations.
通过对银杉主要群落种群的数量统计和年龄组成的分析，编绘了银杉种群的特定时间生命表、存活曲线和年龄结构图。
The time specific life table, survivorship curve and age structure of Cathaya argyrophylla population were obtained through analysing the demography and age structures of its main coenopopulations.
通过对银杉主要群落种群的数量统计和年龄组成的分析，编绘了银杉种群的特定时间生命表、存活曲线和年龄结构图。
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