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抛物线面 : 33 phrases in 10 subjects |
| Antennas and waveguides | 4 |
| Astronautics | 1 |
| Aviation | 1 |
| Electronics | 1 |
| General | 7 |
| Mathematics | 1 |
| Nanotechnology | 1 |
| Nautical | 1 |
| Technology | 15 |
| Telecommunications | 1 |
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