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无碰 撞 : 20 phrases in 9 subjects |
| Aviation | 2 |
| Electronics | 2 |
| General | 1 |
| Information technology | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Space | 4 |
| Technology | 7 |
| Telecommunications | 1 |
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