Specifically, paleontologist Mark Purnell of the University of Leicester in England and his colleagues found four sets of striations oriented in different directions on the teeth of Edmontosaurus.
英格兰莱切斯特大学的古生物学家MarkPurnell和同事们在埃德蒙顿龙的牙齿上发现了四组不同方向的纹路。
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