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| 41. | underground shaft |
| 肓竖井 |
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| 42. | perpendicular shaft |
| 垂直轴 |
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| 43. | octagonal shaft |
| 八角钻杆 |
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| 44. | shaft deepening |
| 立井开凿 |
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| 45. | appendworm shaft |
| 蜗轴 |
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| 46. | serration shaft |
| 锯齿形花键轴 |
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| 47. | suspension shaft |
| 起吊轴 |
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| 48. | shaft penetration |
| 竖井穿孔 |
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| 49. | cylindrical shaft |
| 圆柱形轴 |
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| 50. | shaft enclosure |
| 竖井封闭空间 |
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