yolk epithelium

例句：

1. 1. The study of the yolk epithelium is crucial for understanding the developmental processes in chickens.
   研究卵黄上皮对于理解鸡的发育过程至关重要。
2. 2.The researchers found that the yolk epithelium plays a vital role in egg formation.
   研究人员发现，卵黄上皮在蛋的形成过程中起着至关重要的作用。
3. 3.The yolk epithelium is responsible for producing the nutrients necessary for embryonic development.
   卵黄上皮负责产生胚胎发育所需的必要营养物质。