keriotheca

例句：

1. 2.
   某些昆虫的
2. 3.
   某些昆虫的
3. 1. The spider's exoskeleton is made of chitin, which gives it strength and flexibility.
   蜘蛛的外骨骼由几丁质制成，赋予它强度和灵活性。
4. 2. The beetle's exoskeleton protects its soft parts from predators.
   甲虫的外骨骼保护其柔软部分免受捕食者的伤害。
5. 3. The caterpillar's exoskeleton is a protective layer that grows as the insect develops.
   蚕蛾的外骨骼是随着昆虫发育而生长的保护层。