| 凹地 concave ground | 凹地带 hollow zone | 凹坑 pit | 凹垫圈 cupped washer | 凹壁 recess | 凹多边形 concave polygon | 凹多面体 concave polyhedron | 凹头螺钉 socket screw | 凹岸 cutbank | 凹底 kick | 凹底刨 concave plane | 凹底平车 well car | 凹底车 trestle | 凹度 concavity | 凹度容差 valley tolerance | 凹斑 pit | 凹映射 concave mapping | 凹曲度 concave curvature | 凹曲线 sag vertical curve | 凹曲线饰 hypophyge | 凹板 notch board | 凹椅座 dropped seat | 凹榫 blind mortise | 凹榫槽 sunk coak | 凹槽 indentation |
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