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| 51. | tunnel boring works |
| 隧道挖掘工程 |
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| 52. | depth of vertically digging |
| 垂直挖掘深度 |
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| 53. | dig with a pick |
| 用镐挖掘 |
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| 54. | potato raising plough |
| 马铃薯挖掘犁 |
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| 55. | optimum height of cut |
| 最佳挖掘高度 |
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| 56. | spiral cutter-head |
| 螺旋形挖掘头 |
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| 57. | quarried products |
| 冰川挖掘产物 |
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| 58. | excavating and loading teeth |
| 挖掘装载齿 |
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| 59. | optimum depth of cut |
| 最佳挖掘深度 |
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| 60. | excavation plan |
| 挖掘工程计划 |
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