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地下 线 : 70 phrases in 11 subjects |
| Antennas and waveguides | 1 |
| Astronautics | 1 |
| Construction | 1 |
| Electronics | 9 |
| General | 24 |
| Geology | 4 |
| Military | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 5 |
| Technology | 22 |
| Telecommunications | 1 |
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