commensal

Widespread outbreaks of intestinal disease are so rare that the commensal bacteria face little danger of extermination.

而且发达国家大规模爆发肠道疾病的可能性很小，使共栖菌被消灭的危险性也大大降低。

Under their theory, it is in these biofilms in the appendix, well positioned to avoid pathogens in the rest of the gut, that commensal bacteria take refuge.

按照他们的理论，正是这些阑尾中的生物薄膜给共栖菌提供了一个避难所，因为阑尾在人体内的有利位置使共栖菌避免受到其他肠道病原体的侵袭。