目前我国面临的水体富营养化问题较为严重，外源污染控制是解决这个问题的有效途径之一。
Lake Eutrophication is a serious problem in our country, and outer pollution control is an effective way to solve this problem.
说明控制外源污染是河流保证自我修复能力的关键。
It is concluded that controlling the external pollution resource is the key factor to guarantee self-purification ability of river.
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