以下为句子列表：
英文: As a species of mixed forests, nitrogen fixation trees play an important role in improving forest land nutrient and moisture status, maintaining soil productivity, enhancing forest land productivity, and accelerating main species growth.
中文: 作为混交树种，在混交林中发挥着改善林地养分及水分状况，维持地力，提高林地生产力，很好地促进主要树种生长的重要作用。
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英文: Because of the nitrogen fixation of legumes, even though legume forages absobed more nitrogen than grass forages, the soil nitrogen and organic matter used by legume forages were less than grass forages.
中文: 豆科牧草耗氮量虽然比禾本科牧草多，但由于豆科牧草具有固氮作用，因而对土壤全氮和有机质的消耗量却比禾本科牧草低。
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英文: EFFECT OF VA MYCORHIZA ON THE PHOSPHORUS UPTAKE AND NITROGEN FIXATION OF PHASEOLUS AUREUS
中文: VA菌根对绿豆(Phaseolus aureus)吸磷和固氮的影响
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英文: Isolation and Identification of Nodulin Genes Involved in Symbiotic Nitrogen Fixation of Astragalus Sinicus L.
中文: 紫云英参与共生固氮的结瘤素基因的分离与鉴定
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英文: Advance in the Study on Molecular Biology of Nitrogen Fixation in Photosynthetic Bacteria
中文: 光合细菌固氮分子生物学研究进展
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