短語詞組短語convex closed curve [數(shù)]凸閉曲線convex vertical curve 凸形豎曲線convex verticing curve 凸形豎曲線connected convex curve search 凸性連通分支搜索concave -convex curve 凸凹曲線strictly convex curve 嚴格凸平面曲線closed convex curve 卵形線 返回 convex curve