" The brain is very inaccessible, especially the early fetal stages. It's just not ethical to study normal, healthy human brains."

“大脑很难进入，尤其是胎儿早期。研究正常健康的人脑是不道德的。”

So it's just nice to see how the two are made of a similar density of material even at the fetal stage.

所以即便看到的是胎儿阶段这两个部位相似密度的物质组成，也是很高兴的。