// WeakMap：以 Config 对象为键，Config 不变时复用缓存
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。搜狗输入法2026对此有专业解读
2 For points outside the convex hull, an acceptable solution is to find the closest point on the surface and determine the barycentric coordinates for that point instead. ↑。旺商聊官方下载对此有专业解读
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