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。
w=c So, I have my level surface, w equals c I have a curve on that, and at some point I'm going to have a certain velocity.
画出等值面,上面有一条曲线,某点处，有某个速度。
I thought that the W. P. A. insurance should cover all principal risks whilst, according to what you say, this W. P. A. cover means very little.
“我想”“水渍险”“应包括全部主要风险，而根据你所说的，这种水渍险所承保责任却最很少。”
However, I am afraid that if you already submit the proposal also to other professors in W or professors in other university or not, and the multiple proposal is rejected by the W Office.
第二段的意思是不是让我把已经申请的情况告诉他。我在回信中说明了我申请的他们学校的其他教授，我把其他人都拒了，并且其他人都没有回信。这样作对么？
However, I am afraid that if you already submit the proposal also to other professors in W or professors in other university or not, and the multiple proposal is rejected by the W Office.
第二段的意思是不是让我把已经申请的情况告诉他。我在回信中说明了我申请的他们学校的其他教授，我把其他人都拒了，并且其他人都没有回信。这样作对么？
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