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.
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