The rat yawned. He straightened his whiskers.

老鼠打哈欠。它拉拉。

While yawning is contagious, not everyone catches a yawn.

虽然打哈欠会传染，但不是每个人都会打哈欠。

It is years since I have seen anyone yawning.

好些年来我没有看见过任何人打哈欠。

Yawns, to me, are objects of curiosity.

对我来说，打哈欠倒是新奇的事。

Soon he was able to scratch and yawn simultaneously.

很快，它就能一边抓挠一边打哈欠了。

We yawn to take in more oxygen.

我们打哈欠是为了吸入更多氧气。

Another sure sign of this attachment is a yawn.

亲密关系的另一个明显表征是打哈欠。

Which animal might yawn when its owner does?

哪种动物会在主人打哈欠的时候打哈欠？

As he yawned, he opened a mouth as big as an oven.

他一打哈欠，就张大他像炉口似的嘴巴。

However, the link between yawning and empathy is inconclusive.

然而，打哈欠和同理心之间的联系尚无定论。

Dogs! Dogs can catch a yawn from their owners.

小狗！小狗会跟着它们的主人打哈欠。

So, essentially, yawning is more contagious if we identify with the person who yawns first.

所以，从本质上讲，如果我们认同第一个打哈欠的人，打哈欠就更有传染性。

So, why did you just yawn?

那你刚刚为什么打哈欠？

I can yawn. It's 2: 30 in the morning.

我只是在打哈欠 这都早上2点半了。

Probably the most popular theory of contagious yawning is that yawning serves as a form of nonverbal communication.

关于传染性打哈欠最流行的理论，可能是打哈欠是一种非语言交流的形式。

But for now (yawn) can I crash on your couch. I'm beat!

但现在（打哈欠）我能在你的沙发上休息一下吗？我累坏了！

Scientists have proposed many theories for why we catch yawns.

科学家们提出了许多理论来解释为什么我们会打哈欠。

What biological function does yawning have?

打哈欠有什么生物学功能？

Great yawn, Finn! A yawn, of course, is that typical reaction of someone who is bored.

好大一个哈欠啊，菲恩！没错，打哈欠可是人们无聊的一个典型表现。

Catching a yawn shows you're attuned to a person's emotions.

打哈欠表明你能适应一个人的情绪。