The concept of healthy rivers lays emphasis on the importance of protection of river ecosystem and also accepts the rationality of appropriate development of water resources.

河流健康的概念既强调了保护河流生态系统的重要性，也承认人们适度开发水资源的合理性。

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The concept and evaluation method of river ecosystem health were discussed.

探讨了河流生态系统健康的概念和评价方法。

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Firstly, this thesis introduced the components, structure, characteristics and functions of a river ecosystem.

首先，系统阐述了河流生态系统的组成、结构、特点和功能。

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Each group should research the location of the river, its benefits to people and animals, the current condition of the river and the potential effects on the river's ecosystem and the local community if the river were to become contaminated.

CNN: Rivers feel heat as U.S. energy demand rises

After they moved into their own Monticello in 1991, the Kauffmans became enamored of the river's fragile ecosystem: the tidal marshes, the nesting osprey and the threatened native oyster beds.

FORBES: Ultradeductible