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碎片 石 : 50 phrases in 10 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Bridge construction | 1 |
| Desert science | 1 |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 4 |
| General | 4 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 32 |
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