以流域为研究单元，对生态环境进行研究和保护是现代环境管理的必然趋势。
Carrying on research and protecting the environment based on watershed unit has become the trend of the modern environmental management.
以流域为研究单元，对生态环境进行研究和保护是现代环境管理的必然趋势。
Carrying on research and protecting the environment based on watershed unit has become the trend of the modern environmental management.
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