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在人体消化道和泌尿道存在许多微生物．例如：大肠杆菌，肠杆菌，拟杆菌，乳杆菌等。这些微生物菌群在正常情况下通过与细胞密切接触，交换能量．物质相互传递信息．与宿主保持生态平衡．形成一种正常微生态系统，对宿主有利．或者双方都有利。但当体内外环境发生变化时．这些
There are many microorganisms in the human digestive and urinary tract. For example: Escherichia coli, Enterobacter, Bacteroides, Lactobacillus and so on. Under normal conditions, these microbial flora exchange energy through close contact with the cells. Materials communicate information to each other. Maintain an ecological balance with the host. Form a normal micro-ecosystem that is good for the host. Or both are good. However, when the environment changes both inside and outside the body. These ones