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回波定 : 33 phrases in 13 subjects |
| Agriculture | 1 |
| Air defense | 3 |
| Automobiles | 1 |
| Aviation | 4 |
| Desert science | 1 |
| Electronics | 3 |
| General | 3 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Space | 8 |
| Technology | 5 |
| Telecommunications | 1 |
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