短语词组短语convex -hull approximation 凸包逼近convex x hull 凸包closed convex cones hull 闭凸锥包convex closed hull [数]凸闭包convex cone hull 凸锥包absolutely convex hull 绝对凸包convex hull property 凸面被覆;凸多边形特性Finding the convex hull 寻找凸包 返回 convex hull