endoskeleton [ˈendoʊskelɪtn]

例句:

• The tortoise endoskeleton has the adaptation of having an external shell fused to the ribcage.
  来自BBC
• Bones are rigid organs that form part of the endoskeleton of vertebrates.
  骨为坚硬的器官,为脊椎动物内骨骼的一部分.
  
• The combination of characters in T. roseae helps to resolve the relative timing of modifications in the cranial endoskeleton.
  来自SA