They're trying to achieve satisfaction through their mouth of a sort they didn't get in this very early stage of development.

他们想通过这种口腔运动,来获得本该在口腔期获得的满足感。

耶鲁公开课 - 心理学导论课程节选

What's a physical mechanism that could lead to differences between these two cells at this very early stage of development?

什么样的生理机制导致细胞,在发育伊始就产生这些差异

耶鲁公开课 - 生物医学工程探索课程节选

And finally, there is regression, which is returning to an earlier stage of development.

最后，来说说退行，意思是回归到发展的某个早期阶段。

耶鲁公开课 - 心理学导论课程节选

This surface layer thickens at an early stage in a mouse after 8 days of development.

发育8天后，老鼠早期胚胎的,外胚层开始增厚。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选