• The cells of this surrounding sheet have become different in some way and they develop into the placenta and the extra embryonic tissues.

    环抱在周围的这一层细胞,已经开始逐渐分化,最终成为胎盘,及额外的胚胎组织

    耶鲁公开课 - 生物医学工程探索课程节选

  • These cells around the outside form the interface, the placenta, where the maternal blood circulation meets the embryonic circulation and nutrients are passed back and forth that way in a very highly regulated and important way.

    外层的细胞形成接触面,即胎盘,是母血与胎血,进行血液交换,及营养物质交换的场所,整个过程高度有序并且非常重要

    耶鲁公开课 - 生物医学工程探索课程节选

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