灾害往往伴随在人类与自然系统的交互作用中。
Usually disasters happen within the interaction between humankind and natural system.
经济系统与自然系统之间也存在着负反馈关系。
Also economic system and natural system exist a negative feedback.
因为相关知识还不完备，很多自然系统也不是必然地处于稳定状态。
Knowledge is incomplete, and natural systems are not necessarily stable.
因为相关知识还不完备，很多自然系统也不是必然地处于稳定状态。
Knowledge is incomplete, and natural systems are not necessarily stable.
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