Sabers were closing in on him.

几只齿虎包围了他。

Well, well-meaning caveman, imagine a saber-toothed tiger is running after you and you need to respond.

好吧，善意人，想象一只齿虎在追你，你需要做出反应。

And then there was the most infamous cat of all, the sabertooth.

而另一个例子就是鲜为人知齿虎。

We're at the top of the food chain, we don't have to defend ourselves from saber-toothed Tigers anymore.

现在人类处于食物链顶端，不必再去保护自己免受齿虎威胁了。

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

个巨大牙齿是齿虎犬齿，是一种有巨大牙齿猫科动物。

Here is the skull of a giant sloth and vertebrae and bones from giant saber-toothed cats and dire wolfs.

是一个巨大树懒头骨，巨大齿虎椎骨和惧狼骨头。

Yeah, what I'm holding here in my hand is pretty much what was walking around inside of the living Smilodon.

对，我现在手里拿着就是活着齿虎身体里长出牙齿。

These stripes serve to warn off most attackers, but perhaps the sabertooth is yet to learn exactly what they mean.

纹用来警告大多数捕猎者，但是只齿虎似乎还没有意识到纹具体含义。

You want the arteries that supply your muscles to dilate so that you can run away from the saber-toothed tiger.

你希望供应肌肉动脉扩张，样你就可以逃离齿虎。

Just remember to be wary of the saber-toothed tigers that would be running around.

请记住要提防四处奔跑齿虎。

Oh, hey, some saber-toothed tigers are doing it over there.

哦，嘿，那边有几只齿虎正在交配呢。

And also the whole conversation about, like, you've got to find a saber-toothed tiger.

另外，关于“你必须找到一只齿虎”整个对话。

No saber-toothed tigers coming to kill you.

没有齿虎来杀你。

Well, there's not a saber-tooth tiger out there.

好吧，那里并没有齿虎。

After killing a saber-toothed tiger, they all went into the cave and slept.

杀死齿虎后，他们都进了山洞睡觉。

Yeah, life is one big saber-toothed tiger.

是啊，生活就像一只巨大齿虎，时刻准备着扑过来。

He's an overexaggerated smilodon with comical green hair.

他就像个长着绿毛极度夸张齿虎一样。

Why are saber-tooth tigers extinct and regular tigers not extinct?

为什么齿虎灭绝而普通老虎没有灭绝？

All right. So why are saber-toothed tigers extinct but regular tigers are not extinct?

好。那么，为什么齿虎已​​经灭绝，而普通老虎却没有灭绝呢？

That suggests both the saber-toothed tigers and the direwolves were locked in a miserable downward spiral.

那表明齿虎和恐狼都陷入了悲惨衰退漩涡。