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双 因子 : 41 phrases in 12 subjects |
| Agriculture | 11 |
| Animal husbandry | 5 |
| Business | 6 |
| Chemistry | 1 |
| Desert science | 2 |
| Earth sciences | 1 |
| General | 2 |
| Genetics | 7 |
| Mathematics | 2 |
| Reproductive biology | 2 |
| Space | 1 |
| Technology | 1 |
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