And their jaws are so powerful, they could crush a watermelon like a grape!

它们的下颚非常有力，可以把西瓜像葡萄一样压碎！

Yeah, growing jawbones and toenails and, uh, clumps of hair. Yeah, I've been listening.

是啊，长出了下颚骨还有脚指甲，和一块一块的毛发。嗯，我一直在听着呢。

Their jaws are stronger than German shepherds and pit bulls with a bite force of 328 pounds that's about half of a shark's bite force, at 669 pounds.

它们的下颚比德国牧羊犬和比特犬更有力，咬合力高达328磅，约为鲨鱼咬合力669磅的一半。

My mom told me I had a big jaw.

我妈说我的下颚很宽。

And the word jaw is used to describe the lower part of the face, which the chin is part of. So, we now know exactly what the chin is. But why did it develop?

下颚是指我们脸下面的部位，它包括了我们的下。我们现在知道了到底什么是下。但是人类为什么会长下呢？

Jaw drops for the beginning of the sound, back of tongue lifts.

在开始发个音的时候，张开下颚，提起舌根。

Don't look him directly in the mandibles.

你可别直视他的下颚。

In the bottom of the jaw, there's a dense area.

在下颚的底部，有一个密集的区域。

The jaws of this ant have evolved ultra-fast acceleration to catch prey.

种蚂蚁的下颚进化出超快的加速度来捕捉猎物。

Your jaws and your throat muscles slow down a lot of competitive eaters.

下颚和喉咙肌肉会拖累很多大胃王。

Right? And you don't see a lot of jaw movement here.

你在不到很多下颚运动。

His chin, too, had the prominence and squareness which mark the man of determination.

下颚方正而突出，说明他是个非常有毅力的人。

We have four of them in our upper jaw and four in our lower jaw.

八颗门牙分别是上颚有四个，下颚有四个。

Something about the wound radius and the jaw pattern. -Are we in danger?

那个伤口的半径大小还有下颚形状。-我们有危险了么？

It's picking up particles of soil and passing them to its mandibles.

它正在捡起土壤颗粒，然后放进下颚。

All right even on the bottom jaw.

好吧，连下颚也是如此。

Your jaw is the lower part of your face below your mouth.

你的下颚就是指你脸部嘴下方的部位。

And many scientists think that as people's diets have become less chewy, their jaws have gotten smaller — and that this has led to dental crowding, resulting in dental crookedness and impacted wisdom teeth.

许多科学认为，当人的饮食变得不那么需要咀嚼，他们的下颚就变小了——就导致牙齿拥挤，造成咬合不正以及阻生智齿。

Its bottom jaw was hooked on my pants.

它的下颚钩在了我的裤子上。

The man's mouth and chin and cheeks were smeared with blood.

那人的嘴、下颚和脸颊沾满血污。