There are two forms of locomotion in dinosaurs, there is bipedal and quadrupedal.
恐的运方式有两种,两足运和四足运。
But many other scientists think there was something between a bipedal ancestor and the pterosaurs – something that was arboreal, and quadrupedal that hasn't been found in the fossil record yet So the evolution of pterosaurs is still foggy.
但许多其他科学家认为, 两足物的祖先和翼之间存在某种东西——某种树栖物,以及尚未在化石记录中发现的四足物, 因此翼的进化仍然是迷雾重重。