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| 51. | excavation plan |
| 挖掘工程计划 |
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| 52. | quarried products |
| 冰川挖掘产物 |
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| 53. | optimum depth of cut |
| 最佳挖掘深度 |
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| 54. | grab type dredge |
| 抓斗挖掘船 |
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| 55. | spiral cutter-head |
| 螺旋形挖掘头 |
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| 56. | potato raising plough |
| 马铃薯挖掘犁 |
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| 57. | tunnel boring works |
| 隧道挖掘工程 |
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| 58. | visit the excavations |
| 参观挖掘现场. |
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| 59. | excavating and loading teeth |
| 挖掘装载齿 |
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| 60. | excavation without timbering |
| 无支撑挖掘 |
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