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