Dinosaurs replace their teeth throughout their life. And T. rex replaced all of their teeth every year.

Dinosaurs replace their teeth throughout their life. And T. rex replaced all of their teeth every year.

恐龙一生都在更换牙齿。雷克斯霸王龙每年都更换它们所有的牙齿。

-- Jack Horner 杰克·霍纳