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覆岩层 : 43 phrases in 10 subjects |
| Bridge construction | 1 |
| Desert science | 3 |
| Drilling | 5 |
| Electronics | 1 |
| Engineering geology | 7 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Geology | 2 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 6 |
| Technology | 14 |
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