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弹道 飞行 : 60 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 12 |
| Biophysics | 2 |
| Electronics | 4 |
| General | 3 |
| Mathematics | 2 |
| Missiles | 1 |
| Space | 32 |
| Technology | 1 |
| United States | 2 |
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