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常角 : 31 phrases in 11 subjects |
| Aviation | 1 |
| Desert science | 1 |
| Electronics | 2 |
| General | 4 |
| Geophysics | 2 |
| Latin | 1 |
| Metallurgy | 1 |
| Nautical | 1 |
| Remote sensing | 2 |
| Space | 4 |
| Technology | 12 |
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