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空 : 345 phrases in 13 subjects |
| Automobiles | 1 |
| Aviation | 4 |
| Chemistry | 2 |
| Crystallography | 1 |
| Electronics | 5 |
| Geology | 1 |
| Mathematics | 4 |
| Mining | 7 |
| Nuclear physics | 1 |
| Physics | 7 |
| Radioengineering | 2 |
| Rail transport | 3 |
| Technology | 307 |
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