... premandibular appendages 颚前附器 premandibular 上颚前的 prematuration period 成熟前期 ...
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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。
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.
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