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| 固氮［细］菌 | |||
| 固氮细菌 | |||
| 固氮菌 | |||
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| 固氮菌 | |||
| 固氮细菌 | |||
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nitrogen fixing bacteria : 9 phrases in 3 subjects |
| Agriculture | 5 |
| Technology | 2 |
| Water resources | 2 |
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