离肠腔越近，粘液就越稀薄，在最靠近肠腔的外粘液层处就是肠道人体共生菌（commensal bacteria）的栖息场所。这层粘稠的内粘液层如果到了小肠内就会适得其反，不仅不能对人体起到帮助作用，反而会阻碍小肠的营养吸收功能。
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Lactic acid bacteria inhabit the guts of food-animals and people, and these "commensal" bacteria play an important role in preventing the growth of harmful bacteria in the gut.
乳酸菌生活在食用动物和人类的肠道中。这类“共生”细菌在预防肠道有害细菌生长方面发挥着重要作用。
Summarizing the studies obtained, sediment, commensal, and symbiotic bacteria were more important in searching for nature pharmaceutics.
从报道的研究结果看，沉积物细菌、共栖细菌和共生细菌是海洋微生物天然药物筛选的重要来源。
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