vitelline area

例句：

1. 1. The vitelline area is where the egg develops into an embryo.
   卵黄区是胚胎发育的地方。
2. 2. The vitelline area is responsible for producing hormones that regulate cell growth and division.
   卵黄区负责产生激素，调控细胞生长和分裂。
3. 3. In some species, the vitelline area can be used to identify the sex of the offspring.
   在某些物种中，卵黄区可以用来识别后代的性别。