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这意味着，沿一条闭合曲线，势函数的变化量是。
That means when you go along a closed curve, 0 well, the change of value of a potential should be zero.
空间上存在一条闭合曲线，我需要看出它是什么的边界。
Stokes says if I have a closed curve in space, now I have to decide what kind of thing it bounds.
如果这么做的话，就能得到区域上的一条闭合曲线,它包围了这个区域。
So now if I take, see, I can form a single closed curve that will enclose all of this region with kind of an infinitely thin slit here counterclockwise.
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