Foods like yogurt and fermented foods naturally contain bacteria called probiotics. 像酸奶和發(fā)酵食品之類(lèi)，自然含有所謂的益生菌。
And there are "prebiotics," too, which contain fiber and other nutrients that feed probiotic bacteria. 然而這些包含了纖維和其它營(yíng)養品的原生物同時(shí)也為益生菌提供了食物的來(lái)源。
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