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亚系 : 38 phrases in 13 subjects |
| Agriculture | 1 |
| Ecology | 1 |
| Education | 1 |
| Electronics | 1 |
| Environment | 1 |
| General | 21 |
| Geology | 1 |
| Linguistics | 1 |
| Mathematics | 2 |
| Oil processing plants | 1 |
| Politics | 1 |
| Technology | 2 |
| United Nations | 4 |
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