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研究开发中 心 : 25 phrases in 10 subjects |
| Aviation | 2 |
| Earth sciences | 8 |
| Economy | 1 |
| Electronics | 7 |
| Environment | 1 |
| Navigation | 2 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| United States | 1 |
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