Define the center curves of the top contour for blades.

其主要步骤有：1。定义叶片轮廓曲面的中心曲线。

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Then we define the boundary strength function and the feature boundary of each patch, to construct a deformation contour on the patch's boundary.

然后定义分割片的特征边界和边界强度函数，用以表示各预分割区域边界上的形变模型；

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Then we define the boundary strength function and the feature boundary of each patch, to construct a deformation contour on the patch's boundary.

然后定义分割片的特征边界和边界强度函数，用以表示各预分割区域边界上的形变模型；

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