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检振器 : 20 phrases in 10 subjects |
| Astronautics | 1 |
| Aviation | 1 |
| Electronics | 1 |
| General | 2 |
| Geology | 1 |
| Nanotechnology | 1 |
| Oil processing plants | 1 |
| Radio | 1 |
| Seismology | 1 |
| Technology | 10 |
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