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多次地 : 16 phrases in 10 subjects |
| Agriculture | 1 |
| Desert science | 2 |
| Drilling | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 1 |
| Geophysics | 1 |
| Mining | 2 |
| Oil / petroleum | 3 |
| Racing and motorsport | 1 |
| Technology | 2 |
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