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| 51. | optimum height of cut |
| 最佳挖掘高度 |
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| 52. | bench excavation |
| 台阶式挖掘 |
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| 53. | continuous bucket dredge |
| 多斗挖掘船 |
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| 54. | optimum depth of cut |
| 最佳挖掘深度 |
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| 55. | sea-going dredge |
| 海洋挖掘船 |
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| 56. | dig with a pick |
| 用镐挖掘 |
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| 57. | dredge stripping |
| 挖掘船剥离 |
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| 58. | quarried products |
| 冰川挖掘产物 |
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| 59. | depth of vertically digging |
| 垂直挖掘深度 |
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| 60. | spiral cutter-head |
| 螺旋形挖掘头 |
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