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复 面的 : 23 phrases in 12 subjects |
| Air defense | 1 |
| Artificial intelligence | 1 |
| Aviation | 1 |
| China | 1 |
| Finances | 1 |
| General | 4 |
| Metallurgy | 2 |
| Mining | 1 |
| Otorhinolaryngology | 1 |
| Project management | 1 |
| Space | 3 |
| Technology | 6 |
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