...人体各部位经常寄居而对人体无害的微生物称之为正常微生物群（normal flora of microbe）或正常菌群（normal flora of bacteria）。正常菌群大部分是长期居留于人体的又称为常住菌，也有少数微生物是暂时寄居的，称为过路菌。
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Following are general discussion of normal bacteria flora, their relationship with health and how to adjust dysbacteria into normal.
主要介绍肠道正常菌群的概况、与人体的利害关系、以及菌群失调的调整等。
Abstract: Lactic acid bacteria, as the normal bacteria in the intestine, plays an important role in maintaining microbial flora balance of the intestine and regulating the metabolism of animals.
摘要乳酸菌作为动物肠道的正常菌群，在维持动物肠道的微生态平衡和调节动物代谢方面发挥重要作用。
Abstract : Lactic acid bacteria, as the normal bacteria in the intestine, plays an important role in maintaining microbial flora balance of the intestine and regulating the metabolism of animals.
摘要 ：乳酸菌作为动物肠道的正常菌群，在维持动物肠道的微生态平衡和调节动物代谢方面发挥重要作用。
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