1. 凹入 invagination
  2. 凹入工作面制动器 spoon brake
  3. 凹入部 invagination
  4. 凹凸 concave-convex
  5. 凹凸不平 full of bumps and holes
  6. 凹凸印刷 embossing
  7. 凹凸镜 concave-convex lens
  8. 凹凹 concavo-concave
  9. 凹函数 concave function
  10. 凹凿 paring gouge
  11. 凹刨 fillister
  12. 凹印 gravure
  13. 凹印电子雕刻机 Helio-Klischograph
  14. 凹口 hag
  15. 凹口冲头 notching punch
  16. 凹口剪切机 gap shears
  17. 凹口敏感比 notch sensitivity ratio
  18. 凹口板 notch plate
  19. 凹口比 notch ratio
  20. 凹口研磨机 gap mill
  21. 凹口管节 socket union
  22. 凹口试杆 notched bar
  23. 凹口车床 gap lathe
  24. 凹口销 notch pin
  25. 凹口锯 concave saw
  26. 凹地 concave ground
  27. 凹地带 hollow zone
  28. 凹坑 pit
  29. 凹垫圈 cupped washer
  30. 凹壁 recess
  31. 凹多边形 concave polygon
  32. 凹多面体 concave polyhedron
  33. 凹头螺钉 socket screw
  34. 凹岸 cutbank
  35. 凹底 kick
  36. 凹底刨 concave plane
  37. 凹底平车 well car
  38. 凹底车 trestle
  39. 凹度 concavity
  40. 凹度容差 valley tolerance
  41. 凹斑 pit
  42. 凹映射 concave mapping
  43. 凹曲度 concave curvature
  44. 凹曲线 sag vertical curve
  45. 凹曲线饰 hypophyge
  46. 凹板 notch board
  47. 凹椅座 dropped seat
  48. 凹榫 blind mortise
  49. 凹榫槽 sunk coak
  50. 凹槽 indentation
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