人类生活在一个充满微生物的环境中,消化道作为开放式腔道,其内部定植有大量微生物。这些微生物与人体经过长期相互选择和共同进化,彼此间形成了互利共生的关系,人体为它们提供合适的生存环境,它们也参与宿主的物质代谢和免疫防御,形成了一个相对稳定的系统,即消化道微生态。这 Human life In a micro-environment, the digestive tract as an open cavity, the internal colonization of a large number of microorganisms. After long-term mutual selection and co-evolution, these microbes form a mutually beneficial symbiotic relationship with each other, and the human body provides them with a suitable living environment. They also participate in the host’s material metabolism and immune defense and form a relatively stable system, that is, Digestive tract micro-ecology. This