epichilium

例句：

1. 1. The eggshell is the epichilium of the chicken.
   鸡蛋壳是鸡的外皮。
2. 2.The outer layer of the skin protects it from infection.
   皮肤的外层保护它免受感染。
3. 3. The scientist studied the epichilium of the jellyfish to understand its behavior.
   科学家研究了水母的外皮以了解其行为。