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.
城市土地利用系统是自然、经济和社会复合系统。
Urban land use system is a typical natural, economic and social compound system.
旅游生态学的主要研究对象是旅游生态系统，旅游生态系统是一个社会—经济—自然复合生态系统。
Its research subject is tourism ecosystem which is a compound ecological system of society, economy and nature.
城市是由自然生态系统、社会生态系统、经济生态系统等构成的复合生态系统。
Cities are shaped by natural ecosystems, social ecosystems, economic ecosystems posed by complex ecosystems.
指出要在自然-社会-经济复合生态系统中全面权衡筑坝的利弊得失。
It is pointed out that the advantage and disadvantage of hydropower should be comprehensively evaluated in the compound ecosystem of nature, society and economy.
指出要在自然-社会-经济复合生态系统中全面权衡筑坝的利弊得失。
It is pointed out that the advantage and disadvantage of hydropower should be comprehensively evaluated in the compound ecosystem of nature, society and economy.
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