I'm concerned right now about an active infection in his bottom left canine. - Yeah, that looks very suspicious.

我现在担心是他左下齿活动性感染。— 是啊，看起很可疑。

Canines have a sharp, pointy surface for tearing food.

齿有一个锋利、尖尖表面，用撕裂食物。

And they would come back with canine slashes and stuff like that.

他们会带着齿之类东西。

Technically speaking, a sabertooth is simply any animal with extremely elongated canine teeth.

从技术上讲，剑齿虎就是任何具有极长齿动物。

This giant tooth right here is the canine tooth of a saber-toothed cat from an animal called Smilodon.

这个巨牙齿是剑齿虎齿，这是一种有巨牙齿猫科动物。

They have large canines that they use to rip and tear into their prey.

它们有巨齿，可以用撕裂猎物。

You also see the big canine teeth that they have.

您还可以看到他们拥有齿。

It had four big canine teeth up front and several smaller meat slicing teeth in the back.

它前面有四颗巨齿后面有几颗稍小切肉用牙齿。

Its upper canines were small and non-functional, and it had lost its lower ones entirely.

它上齿很小而且没有任何功能，下齿也完全消失了。

And in Euchambersia, the tooth sockets of its canines are also connected to this canal.

而在欧氏菌属中，其齿牙槽也与这条运河相连。

We can see those large canines, what it would be like to be on the dinner side of a short faced bear.

看到那些很齿，试想一下被短面熊当成晚餐会是什么样吧。

And what he realized was that instead of deep grooves, Euchambersia actually has prominent ridges on its canines.

他意识到，Euchambersia 齿上没有深沟，实际上有突出脊。

One way successful cynodonts, like Thrinaxodon, might have done this is through burrowing.

成功齿兽类，如 Thrinaxodon，可能通过挖洞做到这一点。

If we look at it from this angle, we can see this cut where this large canine would have gone through this bone.

要是我们从这个角度看，我们能看到这个切口，这里就是巨齿咬进这块骨头地方。

But when they compared the distance between those holes with the distances between the upper and lower canines in Thrinaxodon, they didn't match.

但是， 当他们将这些孔之间距离与 Thrinaxodon 上下齿之间距离进行比较，它们并不匹配。

Meanwhile, the descendants of those little cynodonts persisted through the entire Mesozoic Era, hiding in the dinosaur's shadows.

与此同，那些小齿兽类后代， 在整个中生代一直存在，躲在恐龙阴影下。

And in that burrow, researchers discovered the nearly complete remains of a small animal called Thrinaxodon, one of the early mammal relatives known as cynodonts.

在那个洞穴中， 研究人员发现了一种名为 Thrinaxodon 小型动物几乎完整遗骸，它是被称为齿兽早期哺乳动物亲属之一。

It's almost entirely ape-like, but with smaller canine teeth than chimps today, and a skull carried upright instead of at an angle, the way knuckle-walkers carry theirs.

它几乎完全像猿，但是齿比今天黑猩猩小，而且它头骨是直立而不是有角度，就像用关节行走动物那样。

The skeleton had well-developed canine teeth, and was placed within a neatly laid brick structure facing toward the direction of the emperor's tomb, with its tail pointing westward.

骨架有着发育良好齿，被放置在一个整齐砖结构内，头向帝陵，尾巴朝西。

And its incisors were huge – more like those of a rodent than a lion – but they might've filled a similarly stabby role to the canines of carnivorans.

它门牙很——更像啮齿动物而不是狮子——但它们可能扮演了与食肉动物齿类似刺伤角色。