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换马 : 28 phrases in 14 subjects |
| Chemistry | 1 |
| Chess | 1 |
| Cryptography | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| Finances | 1 |
| General | 2 |
| Geology | 1 |
| Geophysics | 1 |
| Mechanics | 1 |
| Multimedia | 1 |
| Securities | 1 |
| Space | 2 |
| Technology | 11 |
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