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| underground structure | |||
| infrastructure; subsurface structure | |||
| substructure; substruction | |||
| buried structure (物); substructure (物); subsurface structure (物); underground structure (物) | |||
| 地 下 结构: 14 phrases in 3 subjects |
| Engineering geology | 4 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 9 |
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