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| 空域空间: 20 phrases in 9 subjects |
| Computers | 1 |
| General | 6 |
| Mathematics | 3 |
| Military | 1 |
| Nanotechnology | 1 |
| Optics branch of physics | 1 |
| Radio | 1 |
| Technology | 3 |
| United Nations | 3 |
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