有颌类包括硬骨鱼类以及软骨鱼类。
Gnathostomes include the bony Osteichthyes and the cartilaginous Chondrichthyes.
软骨鱼类(鲨鱼、鳐、银鲛)仅占有颌类物种数的2%，其余98%的有颌类都属于硬骨鱼类。
Chondrichthyes (sharks, rays and chimaeras) account for only 2% of gnathostome species, the Osteichthyes accounting for the other 98%.
在它们扁圆头部的前端有一对弯曲的尖牙作为颌齿，用来俘获甲壳类生物并将其撕碎。
At the front of their bulbous blue heads they have curved fangs that act as jaws. They use these to capture and tear apart their crustacean prey.
颌类脊椎动物有一种能产生特定抗体以此抵抗外来物质的能力。
Jawed vertebrates have the ability to form specific antibodies in response to many foreign substances.
结论安氏三类错合伴开合患者，行双颌正颌手术后，其开合距离与颏部形态变化有相关性。
ConclusionMesioclusion with open bite patients after orthognathic surgery, their open-bite distance has correlation with chin form.
结果尖牙尖对尖颌位时的接触形式有六类：尖牙保护44。
Results in canine-to-canine position, the occlusal contact mode was classified into six groups: canine protection 44.
结果尖牙尖对尖颌位时的接触形式有六类：尖牙保护44。
Results in canine-to-canine position, the occlusal contact mode was classified into six groups: canine protection 44.
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