n.（动物）内骨骼
Chordates are characterized by an endoskeleton. 脊索动物有特征性的内骨骼。
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。
Cut to: the silhouette of a terminator endoskeleton holding a gun, it's eyes glow red against the darkness. 镜头切换：终结者骨架的侧面，拿着一把枪，它的眼睛对着黑暗发出红光。
Memorize: primary segmentation, secondary segmentation, endoskeleton, appendage, tentorium, phragma, vein, venation. 识记：初生分节、后生分节、内骨骼、附肢、幕骨、悬骨、翅脉、脉序。
9.Chordates are characterized by an endoskeleton. 脊索动物有特征性的内骨骼。
endoskeleton Bony or cartilaginous framework of the body; excludes scales. 内骨骼身体的硬骨或软骨架构；不包括鳞片。
