W-Y-A-T-T, Got it. I haven't heard of the name.Could you hold on the line when I check.
W - Y - A - T - T,好,我没听过这个名字,可以请稍候吗,我去帮你查查看。
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。
So, just to get you used to this idea, I'm going to draw a level surface of a function of three variables OK, so it's a surface given by the equation w of x, y, z equals some constant c.
为了令你们习惯于这个想法,我画一个三变量函数的等值面,这是一个平面,由函数w=c给出的。
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