其骨骼构造非常柔韧，因为他们没有硬骨，只有软骨。

Their skeletal structure is extremely flexible, as it is made of cartilaginous material rather than hard bone.

youdao

其骨骼构造非常柔韧，因为他们没有硬骨，只有软骨。

Their skeletal structure is extremely flexible, as it is made of cartilaginous material rather than hard bone.

youdao