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
应用推荐
模块上移
模块下移
不移动