Vitamin K is routinely given in the first week of life to prevent bleeding.

维生素K要在婴儿出生的第一周内常规性地补充以防出血。

《柯林斯英汉双解大词典》

The integumentary system (which includes hair and nails) is often the first place that a serious vitamin deficiency shows up.

当维生素缺乏时，首先会变现在表皮系统（包括毛发和指甲）。

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Although thiamine was the first vitamin to be called a vitamin it is also known to us as vitamin B1.

尽管硫胺是第一种被称为vitamin的维生素，它却被人们叫做vitamin B1。

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The recent Swedish study described here is not the first study to connect vitamin C and kidney stones.

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"Scientists agree that as the DRIs are revisited, vitamin D is one of the first recommendations that should be reconsidered, " says Patsy M.

CNN: Vitamin D is hot! Here's how to get it

John Neate, chief executive of The Prostate Cancer Charity, said it was not the first study looking at vitamin D in the disease but a consensus on the benefits had not been reached.

BBC: Vitamin D hope in prostate cancer