Amazingly, these mitochondria were once free-living bacteria that were captured by an early single-celled eukaryote. 令人驚奇的是，這些線(xiàn)粒體曾是被早期單細胞真核生物俘獲的自生細菌。
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。
