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| 底脚孔 | |||
| 土壤中的炮眼; 踏脚孔 | |||
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foot hole : 8 phrases in 5 subjects |
| Electric machinery | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Geophysics | 1 |
| Technology | 2 |
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