x Well, we know how to compute partial w over partial x y or partial w over partial y, which measure how w changes if I move in the direction of the x axis or in the direction of the y axis.

我们知道如何计算∂w/∂,或者∂w/∂,这衡量了我在x轴,或者y轴方向上移动时，w的变化。

youdao

What's the rate of change of w when I move like that?

当沿着这个移动，w的变化率如何？

youdao

Well, in fact, I could use any curve drawn on the level of w equals c So, I could move, really,any way I wanted on that surface.

事实上，可以使用等值面W=c上的任何曲线,可以以任何方式在等值面上移动。

youdao

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