There are two forms of locomotion in dinosaurs, there is bipedal and quadrupedal.

恐龙方式有两种，两足和四足。

Pachyrhinosaurus though was a more compact quadrupedal kind of animal, a more sturdy build than what we see in Albertosaurus.

肿鼻角龙是一种更结实四足物，比阿尔伯特龙身体更加粗壮。

So, quadrupedal dinosaurs evolved from bipedal ones.

所以，四足恐龙是从两足恐龙进化而来。

So little Scleromochlus appears to be a bipedal, ancestral cousin of a quadrupedal group.

如此小 Scleromochlus 似乎是四足类两足类远亲。

Did pterosaurs come from bipedal, running ancestors, or quadrupedal ancestors that lived in trees?

翼龙是来自两足、奔跑祖先，还是生活在树上四足祖先？

Tooth shape, bipedal or quadrupedal, number of holes behind the eye in the skull, and so on.

牙齿形状、双足或四足、头骨中眼睛后面孔数等。

And during the transitional stage between quadrupedal and bipedal stance, there is plenty of variation.

在四足和双足姿势之间过渡阶，有多变化。

Before we get into bipedal and quadrupedal dinosaurs lets think again about a group of animals, mainly humans.

在我们进入双足和四足恐龙之前，让我们再想想一物，主要是人类。

There's actually lots of evidence to suggest that, even if their ancestors were bipedal, pterosaurs themselves were quadrupedal.

实际上有多证据表明，即使它们祖先是双足，翼龙本身也是四足。

Humans change their stance from quadrupedal babies, to bipedal adults.

人类将他们姿势从四足婴儿转变为双足成人。

It would have been fast as far as a quadrupedal dinosaur goes, but that's nowhere near as much as a Tyrannosaur would have been.

在四足恐龙当中，它还算快，不过跟暴龙完全没法比。

They have shoulder joints that are oriented for walking on all fours, and the weird tracks they left behind are all quadrupedal.

它们肩关节适合四肢行走，它们留下奇怪足迹都是四足行走。

There are plenty of animals that transition between bipedal and quadrupedal, but there are some animals that can only ever walk on two or four legs.

有多物在两足和四足之间过渡，但有些物只能用两条或四条腿行走。

If he's quadrupedal, you want to make sure that what is absolute here from his performance is his two feet and the markers on the end of the arm extension.

如果他是四足物，您要确保他表演绝对是他两只脚和手臂伸展末端标记。

Based on what you've seen and learned about the anatomy of dinosaurs, do you think this sort of track would have been made by a quadrupedal sauropod, or bipedal theropod?

根据您所见所闻恐龙解剖学知识，您认为这种足迹是由四足蜥脚类物或双足兽脚类物形成吗？

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， 两足物祖先和翼龙之间存在某种东西——某种树栖物，以及尚未在化石记录中发现四足物， 因此翼龙进化仍然是迷雾重重。