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| nitrogen fixation | |||
| nitrogen immobilization | |||
| fixation of nitrogen | |||
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氮 固定 : 28 phrases in 8 subjects |
| Agriculture | 13 |
| Chemistry | 1 |
| Ecology | 1 |
| Environment | 1 |
| General | 2 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 7 |
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