短語詞組短語biological l nitrogen 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 生物固氮傚率biological fixation nitrogen 生物固氮作用Biological Fixation of Nitrogen 生物固氮nitrogen biological fixation 氮的生物固定The Biological Fixation of Nitrogen 生物固定的氮 返回 biological nitrogen fixation