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| fijación del nitrógeno | |||
| nitrogen fixing: 15 phrases in 8 subjects |
| Agriculture | 1 |
| Botany | 1 |
| Chemistry | 1 |
| Environment | 3 |
| Health care | 2 |
| Medical | 2 |
| Microbiology | 2 |
| Natural sciences | 3 |
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