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

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