短語詞組短語biological nitrogen fixation [土壤]生物固氮;生物固氮作用;有生命的物質(zhì)固氮biological manganese fixation 生物固錳biological sand fixation 植物固沙biological nitro fixation 生物固氮biological nitrogen fixation fertilizers 生物固氮肥biological nitrogen fixation characteristic 生物固氮method of biological nitrogen fixation 生物固氮方法rate of biological nitrogen fixation 生物固氮效率 返回 biological fixation