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试 飞 飞机 : 93 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 61 |
| Electronics | 3 |
| General | 6 |
| International trade | 1 |
| Military | 1 |
| Nuclear physics | 1 |
| Space | 13 |
| Technology | 3 |
| United States | 3 |
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