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| 空中 | |||
| in the sky: 11 phrases in 9 subjects |
| Aviation | 2 |
| Bridge construction | 1 |
| Cycle sport | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 2 |
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