concaver凹面体concaveadj.凹的n.凹面；凹线；凹形concave spherical surface凹球面concave spot localization凹点定位concave-down green space下凹式绿地concave-printing machine凹版印刷机concave positive solutions向下凸正解concave programmingproblem凹规划问题concave clearance adjuster凹板间隙调节机构concave reflection grating凹反射光栅concave hyperbolic contour单叶双曲面轮廓concave aspherical surface凹非球面

1. Is it the concave silver mace in legend?
   这就是传说中的凹面银锏？
2. These are aberration-corrected holographic concave gratings.
   下表所列为像差校正全息凹面光栅。