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改型机 : 38 phrases in 10 subjects |
| Automobiles | 4 |
| Aviation | 15 |
| Electronics | 5 |
| General | 1 |
| Metallurgy | 2 |
| Plastics | 2 |
| Polymers | 2 |
| Space | 2 |
| Technology | 4 |
| United States | 1 |
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