endoskeleton
🇺🇸
/ˈendəʊskelɪtn/
🇬🇧
/ˈendəʊskelɪtn/
a structure of bones inside an animal's body that helps it to keep its shape and move
Mammals like humans have an endoskeleton that protects their internal organs.
像人类这样的哺乳动物拥有一种内骨骼,可以保护它们的内脏。