And all skulls have the predentary bone present in ornithischian dinosaurs.

所有的头骨都具有鸟臀目恐龙中的原始骨骼。

The ankylosaur, euplocephalus, ceratopsian, triceratops, and all of the hadrosaurs have a predentary bone.

甲龙、真头龙、角龙、三角龙和所有的鸭嘴龙都有一块掠食骨。

The second trait that distinguishes ornithischians is a special bone in the lower jaw, called the predentary.

区分鸟臀目动物的第二个特征是下颌有一块特殊的骨头，称为前齿骨。

But then we would have to argue that the sharp teeth, absence of predentary bone, pelvis structure, and many other features of Spinosaurus were convergent with theropods, rather than the result of shared ancestry.

但随后我们不得不争辩说，棘龙的锋利牙齿、无前齿骨、骨盆结构和许多其他特征与兽脚类恐龙趋同，而不是共同祖先的结果。