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To alter the gradient of land surface for decreasing the energy of flow.
二是改变地表的坡度，减小水流的能量。
youdao
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The conservative force and the gradient of the potential energy are dual vectors.
保守力与势能梯度互为对偶矢量。
youdao
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The conservative force and the gradient of the potential energy are dual vectors.
保守力与势能梯度互为对偶矢量。
youdao