The keys are active bacteria in yogurt, specifically Lactobacillus bulgaricus and Streptococcus thermophilus.

关键是酸奶中的活性细菌，特别是保加利亚乳杆菌和嗜热链球菌。

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And what about adding extra bacteria in yogurt?

那么能否在酸奶里面添加更多的细菌呢？

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Once, he really wanted me to have some, and with sticky fingers covered in yogurt, he shoved his carrot in my mouth.

有一次，他很想让我也吃点，便用他那黏糊糊的沾满酸奶的小手，把一根胡萝卜硬塞到我嘴里。

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Coming up with something truly original and tangible in yogurt was no mean feat.

FORBES: Magazine Article

Many cows are already fed bacteria much like those in yogurt that reduce the amount of O157:H7 in manure.

FORBES: Magazine Article

So-called probiotics, a mixture of about half a dozen bacterial species found in yogurt, do act to calm this condition.

ECONOMIST: Modern medicine