中文说明：
包括Polygonal Approximations,Signatures,The Skeleton of a Region
English Description：
Including polygon approvals, signatures, the skeleton of a region
olygonal Approximations,Signatures,The Skeleton of a Region
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中文说明：
包括Polygonal Approximations,Signatures,The Skeleton of a Region
English Description：
Including polygon approvals, signatures, the skeleton of a region