这是一个净化水体的伟大环境筹略。

This is a great environmental strategy to clean up the water.

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水生植被具有净化水体的作用。

The hydrophytes can purify water body.

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向农民学习，就是要缝合这个被切断的营养链，让施肥的过程也成为净化水体的过程。

To learn from peasants is to re-stitch the trophic chain and turn fertilization into water purification.

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