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。

youdao

We know that the gradient is perpendicular to this vector that's tangent to the level surface What about other vectors tangent to the level surface?

我们知道梯度向量垂直于这个向量，而速度向量是相切于等值面的，其他相切于等值面的向量，又如何呢？

youdao

Well, that means the gradient is actually perpendicular to the tangent plane or to the surface at this point.

那意味着，梯度向量在这点上，垂直于切平面或者是等值面。

youdao

Mr. Fischer has painted the surface with a faded pale blue hue, a gradient of color he distilled from a landscape photograph using Photoshop, a computer program he employs in much of his work.

WSJ: Urs Fischer's Beds & Problem Paintings Show in Beverly Hills