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极 坐标 系 : 23 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Navigation | 1 |
| Shipbuilding | 1 |
| Space | 8 |
| Technology | 9 |
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