We have seen that the gradient is perpendicular to the level surface.
我们已经知道，梯度是垂直于等值面的。
Then you know that the gradient of g is perpendicular to the level surface.
那么就知道了g的梯度,是垂直等值面的。
Fill them with a subtle white gradient to give your sphere a glossy surface.
为它们填充浅白色，给你的球形一些表面高光。
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。
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。
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