短语词组短語convex closed curve [數]凸閉曲線convex vertical curve 凸形竪曲線convex verticing curve 凸形竪曲線connected convex curve search 凸性連通分支搜索concave -convex curve 凸凹曲線strictly convex curve 嚴格凸平麪曲線closed convex curve 卵形線 返回 convex curve