nucellar

例句：

1. 1. The nucellar membraneis the outer layer of the egg.
   卵膜是蛋的外层。
2. 2. The nucellar cavity is the space inside theegg.
   卵室腔是蛋内的空腔。
3. 3. The nucellar membrane is responsiblefor protecting the developing embryo.
   卵膜负责保护发育中的胚胎。