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| 51. | perpendicular hole |
| 垂直井 |
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| 52. | horizontal hole |
| 水平井眼 |
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| 53. | conduction hole |
| 传导空穴 |
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| 54. | thumb hole |
| 拇指孔 |
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| 55. | intermediate hole |
| 中间炮眼 |
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| 56. | countersunk hole |
| 埋头螺孔 |
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| 57. | hole instability |
| 井壁不稳定 |
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| 58. | emplacement hole |
| 放置孔穴 |
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| 59. | contractor's hole |
| 草率完工的井 |
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| 60. | observation hole |
| (窑炉)观察孔,看火孔 |
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