Although paleontologists had known for many years that the bones of dinosaurs contain growth lines, something like the circumferential growth rings we see in trees, it was only in the second half of the 20th century that they began to use these growth lin
Although paleontologists had known for many years that the bones of dinosaurs contain growth lines, something like the circumferential growth rings we see in trees, it was only in the second half of the 20th century that they began to use these growth lin
虽然早在许多年前，古生物学家就已经知道，恐龙骨骼里有著类似树木年轮的生长线；但直到20世纪后半，生长线及骨骼中的其他结构，才被用来研究这些已灭绝动物的生长情形。