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21. | to dig new channels |
| 挖掘新道 |
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22. | excavating area |
| 挖掘区 |
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23. | excavating plough |
| 挖掘犁 |
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24. | To dig a sap. |
| 挖掘坑道 |
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25. | excavator factor |
| 挖掘系数 |
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26. | digging efficiency |
| 挖掘效率 |
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27. | excavating equipment |
| 挖掘设备 |
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28. | selective excavation |
| 选择挖掘 |
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29. | excavation deformation |
| 挖掘错动 |
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30. | To dig trenches |
| 挖掘堑壕 |
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