endoskeleton

剑桥词典

a hard frame that supports the body of a vertebrate animal on the inside, made of bone or cartilage (= strong tissue )
內骨骼，內骨（支持脊椎動物身躰的內骨架，由骨骼和軟骨組織搆成）
比較
exoskeleton 返回 endoskeleton