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选择 通 道 : 34 phrases in 9 subjects |
| Aviation | 3 |
| Electronics | 14 |
| General | 1 |
| Geophysics | 4 |
| Life sciences | 1 |
| Multimedia | 1 |
| Oil / petroleum | 1 |
| Space | 7 |
| Technology | 2 |
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