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。
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
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。
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