外共生体：生活在另一种生物体外表的共生生物。
Ecto commensal: a commensal organism that lives on the outer body surface of another organism.
体外和动物实验显示，开菲尔中的共生菌群具有抗癌、抗突变以及抗菌等功效。
Moreover, in vitro and animal trials have shown symbiotic microflora in kefir have anticarcinogenic, antimutagenic and antimicrobial properties.
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