A rapidly ageing population in many countries is also a contributing factor.
许多国家人口迅速老龄化也是一个促进因素。
Population was a very comprehensive and crucial factor.
人口是综合性很强的关键因素之一。
Population is the most fundamental factor in the big system of population, resources and environment.
人口是人口、资源与环境巨系统中最根本的因素。
Change of rhizosphere effect was another important factor of population decline.
根际效应的改变是引起差巴嘎蒿种群衰退的又一重要因素。
Temperature was the key factor affecting population dynamics of G.
温度是影响菱角小萤叶甲种群数量消长的关键因子；
Temperature was the key factor affecting population dynamics of G.
温度是影响菱角小萤叶甲种群数量消长的关键因子；
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