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.
城市绿地系统是城市复合生态系统中自然子系统的重要组成部分。
Urban green space system is an important component in complex natural ecosystems of subsystems.
人、社会、自然是一个复合的生态系统，生态危机的解决从根本上说与社会问题的解决紧密相连。
Man, society and nature compose a compound ecological system, and the solution of ecological crisis is closely related to that of social problems.
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.
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.
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.
人类生态环境是一个包括自然环境、社会环境和规范环境在内的复合生态系统。
Human ecological environment is a compound system consisting of natural, social and normative environments.
人类生态环境是一个包括自然环境、社会环境和规范环境在内的复合生态系统。
Human ecological environment is a compound system consisting of natural, social and normative environments.
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