concaveadj.凹的n.凹面;凹线;凹形
concave bit凹形凿,凹形钻头
concave jet凹面射流
concave arc凹圆弧
concave rim凹形轮辋
concave cam凹形凸轮
concave vein凹脉
concave edge凹边,凹面
concave line[计] 凹线
concave boss凸柱
concave face凹面