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空中 : 15 phrases in 9 subjects |
| Electric traction | 1 |
| Electronics | 1 |
| General | 4 |
| Nuclear physics | 3 |
| Physics | 2 |
| Power lines | 1 |
| Radiology | 1 |
| Superconductivity | 1 |
| Thermal Energy | 1 |
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