It is years since I have seen anyone yawning.

好些年来我没有看见过任何打哈欠。

Yawns, to me, are objects of curiosity.

对我来说，打哈欠倒是新奇的事。

The rat yawned. He straightened his whiskers.

老鼠打哈欠。拉拉胡子。

Soon he was able to scratch and yawn simultaneously.

很，能一边抓挠一边打哈欠。

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。

While yawning is contagious, not everyone catches a yawn.

虽然打哈欠会传染，但不是每个都会打哈欠。

We yawn to take in more oxygen.

我们打哈欠是为吸入更多氧气。

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！

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

他一打哈欠，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。

Yeah, it's when you open your mouth wide and take some air in and slowly out.

是的，打哈欠的时候我们会张大嘴巴，吸进空气，然后慢慢的呼出来。

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，打哈欠可是们无聊的一个典型表现。

Dogs! Dogs can catch a yawn from their owners.

小狗！小狗会跟着们的主打哈欠。

Because it's such a well-worn part of my story now. It's a big yawn to hear.

我是怎么写出书来的故事已经是老生常谈，再听们要打哈欠。

Scientists have proposed many theories for why we catch yawns.

科学家们提出许多理论来解释为什么我们会打哈欠。

Contagious yawning also occurs in animals, but it doesn't necessarily work the same way as in people.

传染性打哈欠也发生在动物身上，但不一定和类一样有效。

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

我只是在打哈欠 这都早上2点半。

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，打哈欠更有传染性。

Oh, yes, hang on-yes, you've set me off-yawning, yes yawning is a sign that we are tired! Or bored!

哦，是的，等等——是的，你让我也想这样——打哈欠，是的，打哈欠是我们感到疲倦的一种迹象！或者是无聊！

Research at the Duke Center for Human Genome Variation, sought to define the factors that contribute to contagious yawning.

杜克类基因组变异中心的研究试图确定导致传染性打哈欠的因素。