速度向量总是与曲线相切的。
So, the velocity vector is going to be always tangent to the curve.
例如，在某些情况下，如果已知向量场与曲线相切，或者内积是一个常数等等，那么结果将会很简单。
And, in some cases, for example, if you know that the vector field is tangent to the curve or if a dot product is constant or things like that then that might actually give you a very easy answer.
只是沿着曲线流动，所以通量为零，F与C相切。
They are just flowing along the circle around and around so the flux will be zero. F now is tangent to c.
利用拉格朗日乘子法求解二次曲线和二次曲面之间的最小距离，给出了曲线与曲面相切的条件。
With the Lagrange multiplier method, the minimum distance of the center of a circle and a quadric surface was provided and the tangency condition of curve and surface was given.
其二为一种修整的线接触，展成的等螺距齿面与理论轨迹曲面沿某一空间曲线近似相切。
The new tooth surface can be prolonged by the normal profile of the internal toroidal surface, or replaced by an equal pitch helical surface.
描述了一种与给定多边形相切的有理样条曲线的算法。
An algorithm for constructing rational spline closed curve which is tangent to the given polygon is described.
描述了一种与给定多边形相切的有理样条曲线的算法。
An algorithm for constructing rational spline closed curve which is tangent to the given polygon is described.
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