Their skeletal structure is extremely flexible， as it is made of cartilaginous material rather than hard bone.
其骨骼构造非常柔韧，因为他们没有硬骨，只有软骨。
The waterpermeating layer comprises a skeletal material part and a bonding agent part which is used for bonding a skeletal material.
所述透水层包括骨料部分及粘结骨料的粘结剂部分。
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