国产成人综合95精品视频,亚洲av成人精品一区二区三区,四虎永久免费观看在线,久久久一本精品99久久精品88,天天做天天爱夜夜爽毛片毛片

convexo-concave

英[k?n\'veks??\'k?n?ke?v]
美[k?n\'vekso?\'k?n?ke?v]

基本釋義

adj.
半凸半凹面的

英英釋義

Adjective

  • 1. convex on one side and concave on the other with the convexity being greater than the concavity