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强 反 差 : 39 phrases in 9 subjects |
| Aviation | 1 |
| Electronics | 4 |
| General | 4 |
| Geophysics | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 5 |
| Space | 2 |
| Technology | 17 |
| Telecommunications | 1 |
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