The population system is a dynamical system.
人口是一个动态系统。
Any population problem not only exists in its own system.
任何人口问题，都不仅仅是人口系统内部的问题。
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。
Obviously, the rural population structure is a Compound system in general.
可见，农村人口结构是一个广义上的复合系统。
Obviously, the rural population structure is a Compound system in general.
可见，农村人口结构是一个广义上的复合系统。
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