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| 显 示 选择: 15 phrases in 9 subjects |
| Air defense | 1 |
| Automobiles | 3 |
| Aviation | 4 |
| Electronics | 1 |
| Nautical | 1 |
| Project management | 1 |
| Skydiving | 1 |
| Space | 1 |
| Technology | 2 |
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