The influence of the stochastic external environment upon the population dynamics system have never been considered in ordinary age-dependent system models.
对人口系统的讨论，通常的数学模型没有考虑外界环境对系统的影响。
The influencing factors to tenement price include the aspects of economy, society, population, administration, area, physics, the external environment etc.
对住房价格形成的影响因素有经济、社会、人口、行政、区域、物理、外币环境条件等。
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