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机动 扫描 : 13 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| General | 1 |
| Geology | 1 |
| Information technology | 1 |
| Space | 1 |
| Technology | 3 |
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