Not a natural gut bacterium, B. subtilis has long been used as a probiotic agent in food.

枯草芽胞杆菌并不是一种天然存在于内脏的细菌，它们长期被用作食物的益生菌添加剂。

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B: That's natural.

那很自然。

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“They imply some kind of core problem,” said Thomas B. Cochran, a senior scientist in the nuclear program of the Natural Resources Defense Council, a private group in Washington.

托马斯.B.科克兰是华盛顿私人团体“自然资源保护委员会”核项目的高级科学家，他说：“他们暗示说堆芯出了些问题。”

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There's a very natural quantity that you can call A + B.

有一个很自然的量可以记做 A + B

耶鲁公开课 - 基础物理课程节选

Beer naturally contains a shot of B vitamins. (Not coincidentally, vegans get excited about brewer's yeast.) This entrepreneur isn't the first to see nutrition as a selling point for booze: During World War II Anheuser-Busch advertised Budweiser as a natural source of B vitamins.

FORBES: Magazine Article

Beer naturally contains a shot of B vitamins. (Not coincidentally, vegans get excited about brewer's yeast.) This entrepreneur isn't the first to see nutrition as a selling point for booze: During World War II Anheuser-Busch (nyse: BUD - news - people ) advertised Budweiser as a natural source of B vitamins.

FORBES: To Your Health?

Iceland was a natural place to develop Project B.

NEWYORKER: No Secrets