The outlets sewage is a main point pollution source.

南湖周边排污口排放的污水南湖污染的一个主要来源。

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But the main contributor of BOD was point source pollution.

而BOD的主要贡献者则是点源污染。

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And agricultural non-point source pollution is the top priority.

而农业面源污染又是重中之重。

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And agricultural non-point source pollution is the top priority.

而农业面源污染又是重中之重。

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