社会经济自然复合系统 natural complex ecosystem
因此，把城市当作一个社会—经济—自然复合的生态系统来研究就显得日益必要，这也是从生态学角度来研究城市问题的一种新的思维方式。
Therefore, it is very important to regard the cities, as the compound ecosystem of society - economy-nature, and it is also a new mode of thinking to study urban problems from the Angle of ecology.
石漠化土地是自然社会经济的复合系统。
Rocky desertification land is a multiple system composed by nature and economic society.
吉林西部是一个典型的自然、经济和社会的复合系统，生态环境脆弱，土地沙化、碱化严重。
The western of Jilin Province is a typical compound system of nature, economy and society, with vulnerable eco-environment. The desertification and basification of the soil is serious there.
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