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后象 : 53 phrases in 15 subjects |
| Biology | 2 |
| Cartography | 1 |
| Chemistry | 2 |
| Chess | 1 |
| Education | 1 |
| Electronics | 3 |
| General | 18 |
| Geology | 1 |
| Medical | 5 |
| Metallurgy | 2 |
| Oceanography & oceanology | 1 |
| Oil processing plants | 2 |
| Physics | 1 |
| Radio | 1 |
| Technology | 12 |
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