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挖 隧道 : 73 phrases in 10 subjects |
| Construction | 1 |
| Electronics | 2 |
| Engineering geology | 6 |
| Explosives and Explosive Ordnance Disposal | 5 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 3 |
| Oil / petroleum | 2 |
| Rail transport | 1 |
| Technology | 50 |
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