研究人口——经济系统，首先从人口系统着手，并分别对各子系统进行分析和综合。
The study of population-economy system should start with the population system, and at the same time, every sub-system should be analysed and synthesized.
城市人口容量，指一个城市的生态系统和社会经济系统能够支持多大人口规模得以生存的潜力。
The urban population capacity, refers to the potential in an ecosystem or a social economy system of a city that can support the population survive.
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