as it was for their prehistoric ancestors. 对于其史前祖先也是如此
turtles went back to the seas their ancestors left, 海龟回到了祖先曾离开的大海
although they are not all as terrifying as their ancestors. 虽然它们并非都像祖先那般可怕
just like their ancient ancestors. 就像它们古老的祖先一样
an animal whose ancestors also survived Armageddon. 一种祖先也在大灭绝中幸存的动物
But Dunkleosteus has a weapon its tiny ancestors did not. 但是邓氏鱼 拥有自己微小祖先所没有的武器
they are rarely the top predators their towering ancestors once were... 它们却极少像高大的祖先那般 成为顶级捕食者