他偶然发现了一个450万年前的有袋动物的颌骨。

He came across the jawbone of a 4.5 million-year-old marsupial.

《柯林斯英汉双解大词典》

用主动矫治器行双侧唇腭裂术前矫治前突的前颌骨是合理和有效的手段。

Using active preoperative orthopedics to reposit the protruding premaxilla of bilateral cleft palate is a reasonable and effective approach.

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我们拥有的是上颌的尖端，这是一种叫做前颌骨的骨头；还有一个保藏在牙槽里的、破碎的牙齿。

All we have is the tip of the upper jaws -bones called the premaxillae, and a broken tooth preserved in one socket, "said Dr Martill."

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