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.
稻—鸭—泥鳅复合生态系统的经济效益、生态效益和社会效益。
The study on ecological, economical and social benefits of rice-duck-loach complex ecosystem.
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.
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