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。
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？
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。
Complete this circle by returning to the South East and bringing the point of the stick again to the centre of the Cross, then move with arm outstretched to S. W. corner.
将香料点燃的那头放在你所画的十字的中央，然后伸直胳膊，走向西南角。
The move would tie Mr Obama's fortunes to Afghanistan much as those of his predecessor, George w.
此举将让奥巴马的命运与阿富汗联系在一起，相当类似于其前任乔治·w·布什George W。
The move would tie Mr Obama's fortunes to Afghanistan much as those of his predecessor, George w.
此举将让奥巴马的命运与阿富汗联系在一起，相当类似于其前任乔治·w·布什George W。
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