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草坪的净水作用是由于地表的常绿植被像一层厚厚的过滤系统,在降低地表水流速度的同时把大量固体颗粒物沉淀下来。这些沉淀物除了
The lawn water purification is due to the surface of the evergreen vegetation like a thick filter system, in reducing the speed of surface water, while a large number of solid particles precipitated. These sediments except