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.
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.
伯格尔博士和他的同事们在论文中写道，这块颌骨有一些类似人类的特征，然而，这并不表示这块颌骨的主人就必须是人类。
The jawbone has some human-like features, Dr. Berger and colleagues write, yet that does not mean the owner of the jawbone was necessarily human.
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