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-circulation | -circulation | ||
I think that city rivers and citizens share the | I think that city rivers and citizens share the body. People in the city drink the river water. | ||
The sewage produced by human excretion goes through a purification process and returns to the river. | The sewage produced by human excretion goes through a purification process and returns to the river. | ||
River water becomes the water we drink again. | River water becomes the water we drink again. | ||