Well, for example,if our surface is a plane, a slanted plane given by some equation, ax by cz = d.
比如说,假如我们的曲面是一个平面,由公式ax+by+cz=d给出的,一个倾斜的平面。
If you have a plane, ax+by+cz=d then the normal vector would just be .
如果你有一个平面,,,ax+by+cz=d,那么法向量就是。
Ok, three unknowns, but solving for aX+bY+cZ = d is too much to ask for in a swim drill metaphor.
三个未知因素,好比解三元方程,对一个游泳练习的比喻来说好像太过分了。
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