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挟泥沙

挟泥沙

挟泥沙

挟泥沙

1

As the rate of river bed roughness decreases , a larger flow velocity , so that flood sediment can all embrace the smooth transit .

由于河床粗糙率减小，水流流速较大，使洪水所挟泥沙能全部顺利过境。

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