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性能改 进 : 17 phrases in 10 subjects |
| Air defense | 1 |
| Automobiles | 2 |
| Aviation | 4 |
| Economy | 1 |
| Electronics | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Space | 3 |
| United States | 1 |
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