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双 刀双掷 : 32 phrases in 14 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Earth sciences | 2 |
| Electronics | 5 |
| General | 2 |
| Geophysics | 3 |
| Hydroelectric power stations | 1 |
| Information technology | 4 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 4 |
| Technology | 4 |
| Telecommunications | 1 |
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