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自由陀螺 : 53 phrases in 11 subjects |
| Air defense | 1 |
| Architecture | 1 |
| Aviation | 11 |
| Earth sciences | 1 |
| Electronics | 5 |
| Information technology | 1 |
| Navigation | 2 |
| Oil / petroleum | 2 |
| Shipbuilding | 3 |
| Space | 16 |
| Technology | 10 |
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