yolk-sac endoderm

例句：

1. 1. The development of the embryo is closelyrelated to the formation of the yolk sac endoderm.
   胚胎的发展与卵黄囊内皮的形成密切相关。
2. 2. Duringthe early stages of development, theyolk sac endoderm playsa crucial role in nutrient absorption.
   在发育的早期阶段，卵黄囊内皮在营养物质吸收中起着至关重要的作用。
3. 3.The yolk sac endoderm is responsible for the production ofblood cells and other essential components of thebody.
   卵黄囊内皮负责生产血液细胞和其他身体必需的成分。