Its research subject is tourism ecosystem which is a compound ecological system of society, economy and nature.

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。

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The world is a compound ecological system, with each main factor mutually contacting and interacting to maintain the harmony of world.

世界是一个复合的生态系统，各要素之间相互联系，相互作用，维持着整个世界的和谐。

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Man, society and nature compose a compound ecological system, and the solution of ecological crisis is closely related to that of social problems.

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。

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