Doctor Craven believed that the bleeding took place because aspirin prevented blood from thickening.

VOA: special.2009.10.20

there are many genes that are already expressed and presented in this dimpling and thickening of the outer layer.

在外胚层的凹陷和增厚过程中,表达了很多基因。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

We can see the early signs of ear development Start with the thickening of the outer layer of the embryo, this layer is called the ectoderm.

大家知道，耳朵发育的早期特征,是胚胎外层膜的增厚，这层膜也叫外胚层。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

And shortly thereafter this thickening of the outer surface is dimpling in, its invaginating.

增厚的外胚层很快就,向内凹陷。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选