It is important, however, to recognize that once nodules are formed, rhizobia exist inside a plant membrane and are protected from the direct effects of external soil and environmental stresses.
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释义
然而,必须认识到一旦根瘤形成,根瘤菌便在植物膜内存在,并受到保护以免受外界土壤及环境胁迫的影响。
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