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| 固氮菌固氮: 51 phrases in 13 subjects |
| Agriculture | 14 |
| Biology | 7 |
| Chemistry | 1 |
| Desert science | 9 |
| Ecology | 2 |
| General | 7 |
| Genetics | 1 |
| Latin | 2 |
| Life sciences | 1 |
| Microbiology | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
| Water resources | 3 |
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