It is most outsdanding that since a segment of EE spline curve has to do with only three near control points, it has minute local independent property.
特别是EE样条曲线段仅与三个相邻的控制顶点有关，所以它具有很好的局部独立性，便于在设计时进行局部修改；
The favorate spline function is polynomial in a segment of the domain.
样条函数采用分段的多项式。
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