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| 地下爆破在地下〈如地下矿山,地下硐室、隧道等〉进行的爆破作业 | |||
| 坑内爆炸; 地下爆破 | |||
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underground blasting : 10 phrases in 1 subject |
| Explosives and Explosive Ordnance Disposal | 10 |
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