concaver凹面体concaveadj.凹的n.凹面；凹线；凹形concave vertex method凹点法Concave-convex type凹凸式concave cross section凹形断面concave mounting bolt凹板固定螺栓concave globoidal cam凹弧面凸轮Concave rib elevation凹侧肋骨抬高concave-convex lens凹凸透镜,凹凸镜concave-convex part凹凸部concave-convex game凹凸对策concave milling cutter凹形铣刀