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| 41. | optimum depth of cut |
| 最佳挖掘深度 |
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| 42. | sea-going dredge |
| 海洋挖掘船 |
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| 43. | dredge stripping |
| 挖掘船剥离 |
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| 44. | tunnel boring works |
| 隧道挖掘工程 |
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| 45. | depth of vertically digging |
| 垂直挖掘深度 |
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| 46. | quarried products |
| 冰川挖掘产物 |
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| 47. | dig with a pick |
| 用镐挖掘 |
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| 48. | spiral cutter-head |
| 螺旋形挖掘头 |
|
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| 49. | optimum height of cut |
| 最佳挖掘高度 |
|
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| 50. | excavating and loading teeth |
| 挖掘装载齿 |
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