面霜中的胶原蛋白取自动物皮层。The collagen that is included in face creams comes from animal skin.皮层的内层分化为内皮层.The inner layer of the cortex differentiates into the endodermis.皮层细胞开始分裂.Cortical cells begin to divide....

“皮层”的拼音为：pí céng...

“皮层”的英语可以翻译为：cortex，cerebral cortex，derma，stipitipellis，[电影]Cortex...