Lake Eutrophication is a serious problem in our country, and outer pollution control is an effective way to solve this problem.

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。

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With regard to the former, the article holds the idea that all types of outer environmental cost can be collected and calculated under an external force in terms of pollution prevention and control .

对于前者可通过外部强制力，以污染防治为基础，对各种外部环境成本加以计量和计算。

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