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相分层 : 29 phrases in 9 subjects |
| Agriculture | 1 |
| Animal husbandry | 3 |
| Biotechnology | 1 |
| Electronics | 1 |
| Genetics | 1 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 12 |
| Water resources | 8 |
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