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成对 地 : 15 phrases in 9 subjects |
| Economy | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Finances | 1 |
| General | 3 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Space | 1 |
| Technology | 4 |
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