在ug里画了一条曲面上的曲线（curve on surface），需要在该曲面上对曲线进行偏移，对应的ug命令是insert\curve option\offset in face，现在想编程实现这一操作，我找到一个函数...
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基本上，这两个公式把沿曲线的功，和被曲线包围的曲面上的旋度，联系起来了，曲面是以该曲线为边界的。
Both of these formulas basically relate work on a curve with what happens to the curl on the surface that is enclosed by this curve, that is bounded by this curve.
对于任意完全包含在圆环面上的曲面，这个曲线都不是它的边界。
See, this one also does not bound anything that's completely contained in the torus.
平面上，被曲线包围的就只有一个“曲面”了。
There is only one thing that is enclosed by this curve in the plane.
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