现在，科学家把这种溶脂性养分的类似激素的活动，与身体各个部分的许多机能（包括大脑的运作）建立了联系。
Scientists have now linked this fat-soluble nutrient’s hormonelike activity to a number of functions throughout the body, including the workings of the brain.
不计其数的营养分子和其他成分一起作用，使母乳对宝宝来说如此有益于健康，但是科学家数十年的研究致力于认识其中的两种酶。
A countless number of nutrients and other components combine to make breast milk so healthful for babies. But scientists working decades ago zeroed in on two enzymes.
科学家认为，在最初几周里它能为小小的胚胎提供养分和血细胞。
It is believed that for the first few weeks, it generates nutrients and blood cells for the tiny embryo.
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