nucellar beak

例句：

1. 1.The nucellar membrane is the outer layer of the egg.
   卵室膜是蛋的外层。
2. 2.The nucellar cavity is the space inside the egg.
   卵室腔是蛋内的空腔。
3. 3.The nucellar membrane is responsible for protecting the eggs during fertilization.
   卵室膜在受精过程中负责保护卵子。