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

恐龙的运动方式有两种，两运动和四运动。

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的四动物，比阿尔伯特龙身体更加粗壮。

So, quadrupedal dinosaurs evolved from bipedal ones.

所以，四恐龙是从两恐龙来的。

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

如此小的 Scleromochlus 似乎是四类的两类远亲。

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

翼龙是来自两、的祖先，还是生活在树上的四祖先？

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

牙齿形状、双或四、头骨中眼睛后面的孔数等。

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

在四和双姿势之间的过渡阶段，有很多变。

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

在我们入双和四恐龙之前，让我们再想想一动物，主要是人类。

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

实际上有很多证据表明，即使它们的祖先是双的，翼龙本身也是四的。

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

人类将他们的姿势从四婴儿转变为双成人。

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.

在四恐龙当中，它还算快的，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.

它们的肩关节适合四肢行走，它们留下的奇怪迹都是四行走的。

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.

有很多动物在两和四之间过渡，但有些动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.

如果他是四动物，您要确保他的表演绝对是他的两只脚和手臂伸展末端的标记。

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?

根据您所见所闻的恐龙解剖学知识，您认为这种迹是由四蜥脚类动物或双兽脚类动物形成的吗？

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， 两动物的祖先和翼龙之间存在某种东西——某种树栖动物，以及尚未在石记录中发现的四动物， 因此翼龙的仍然是迷雾重重。