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气发 射 : 63 phrases in 14 subjects |
| Air defense | 1 |
| Automobiles | 4 |
| Aviation | 13 |
| Chemistry | 1 |
| Earth sciences | 5 |
| Electronics | 3 |
| Geology | 1 |
| Geophysics | 1 |
| Nautical | 1 |
| Nuclear physics | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Space | 19 |
| Technology | 11 |
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