concaver凹面体concaveadj.凹的n.凹面；凹线；凹形concave disk colter凹面圆犁刀concave filled weld凹形角焊缝concave circular saw凹面圆锯concave solid cutter凹半圆刃整体铣刀concave sucking disc吸盘状陷窝concave ridging body短凹面起垄犁体concave-convex die凸凹模concaved glass slide带凹孔载物片concave optical tool光学玻璃凹面磨具concave minimization凹极小