A somewhat controversial theory had been proposed about 25 years ago suggesting such dinosaurs were equipped with a hinge between the upper jaw and the rest of the skull.

在25年前，曾有人提出了一个很据争议的理论，认为这种恐龙的上颚有个肌腱和颅骨的其他部分连接。

youdao

Rather than a flexible lower jaw joint, they had a hinge between the upper jaws and the rest of the skull.

他们没有可活动的下颌关节，而是有一条筋腱连接着上颚和头骨。

youdao

Particularlya remounting of the models applied on the hinge axis and reference position ofthe lower jaw is indicated.

尤其强调的是，需要按照下颌的铰链轴位置和参考位重新上合架。

youdao