根据轮毂上曲面的特殊性，提出了采用神经网络方法进行编程，实现数控加工，以取代传统的加工方法的设想。
According to the peculiarity of surface on wheel hub, the method of programming by neural network is presented to realize NC machining instead of traditional machining method.
而在视觉上，就是你无法描述这两个曲面在何处头尾相接。
Visually, it is when one cannot tell when one surface ends and another begins.
也就是，向量场是连续的，且在曲面s上处处可微。
That means you need your vector field to be continuous and differentiable everywhere on the surface s.
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