Sharks have a different structure to most fish: instead of a skeleton made of bone, I hey have a tough elastic skeleton of cartilage.
鲨鱼与多数鱼类的骨架不同，它有结实、有弹性的软骨骨架，而不是骨头组成的骨架。
Sharks have a different structure to most fish: instead of a skeleton made of bone, I hey have a tough elastic skeleton of cartilage.
鲨鱼与多数鱼类的骨架不同，它有结实、有弹性的软骨骨架，而不是骨头组成的骨架。
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