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参考波 : 18 phrases in 9 subjects |
| Air defense | 2 |
| Electronics | 1 |
| Fishery fishing industry | 1 |
| Geophysics | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 8 |
| Telecommunications | 1 |
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