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。

youdao

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

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