不幸的是，少数针对打哈欠的科学调查未能发现人们打哈欠的频率与他们睡觉时长和疲劳程度之间有任何联系。
Unfortunately, the few scientific investigations of yawning have failed to find any connection between how often someone yawns and how much sleep they have had or how tired they are.
她打哈欠是对我打哈欠的条件反射。
当你看到有人打哈欠时，你也会开始打哈欠，你知道这是怎么回事吗?
Do you know how it is when you see someone yawn and you start yawning too?
他们打哈欠似乎与困倦或者无聊没有任何关系，但恰恰相反，打哈欠这一行为的确出现在了活动水平的变化之前。
Their yawning seems to have nothing to do with sleepiness or boredom—quite the reverse—but it does precede a change in activity level.
他们开始打哈欠，我们也开始打哈欠。
如果这个理论是正确的，那么吸入含有额外二氧化碳的空气应该会引起打哈欠，而吸入纯氧应该可以抑制打哈欠。
If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning.
打哈欠是人的本能行为：你不需要去学它，甚至在我们出生之前我们就已经学会打哈欠了。
A yawn is an instinctive behavior: You don't have to learn to do it, and yawns are even present before birth.
尽管婴儿甚至在离开娘胎之前开始不由自主地打哈欠，但在这项研究中的大多数孩子直到4岁才开始有打哈欠传染的迹象。
Although babies begin to yawn spontaneously even before they leave the womb, most of the children in this study didn't show signs of contagious yawning until they were 4.
目前一项新的研究发现大多数孩子对传染性打哈欠不敏感，直到他们4岁左右——而且患自闭症的孩子也比其他孩子不太可能受哈欠传染。
Now a new study has found that most children aren't susceptible to contagious yawning until they're about 4 years old — and that children with autism are less likely to yawn contagiously than others.
很长一段时间，人们都相信打哈欠是因为血液里二氧化碳太多而氧气不足，大脑茎干觉察到这点于是触动了打哈欠的神经。
It was long believed you yawned when there was too much carbon dioxide and not enough oxygen in your blood. A part of your brain called the brain stem detected this and triggered the yawn reflex.
然后他们开始打哈欠，我们也开始打哈欠。
他们发现，马上要打哈欠的那一刻，脑部温度达到峰值，然后就开始下降，最后快速降到打哈欠以前的温度。
The team discovered that brain temperature spikes in the run-up to a yawn, then starts to decline, and finally falls rapidly to pre-yawn temperature.
另一方面，发烧的人打哈欠的时间比身体正常的人少，而控制不住地重复打哈欠可能是糖尿病或中风的症状。
On the other hand, someone running a fever indulges in such ACTS less than normal, while uncontrollable repeats may be a symptom of diabetes or a stroke.
事实上，患有与共情相关疾病的儿童，如自闭症，在观看打哈欠视频的时候，比其他孩子打哈欠更少。
In fact, children with empathy related disorders, such as autism, yawn less and response to videos of people yawning comparing to other children.
研究人员发现，在冬天，一半参与者都会打哈欠，而在夏天打哈欠的受试者只有25%。
The researchers found that half of the participants yawned in winter while only a quarter yawned in summer.
当我们看到其他人打哈欠时，大脑内的镜像神经元进入类似的活跃状态，使得我们被传染打了哈欠。
When we view someone else yawn, the mirror neurons in our brain become activated in a similar way and as a result we copy the yawn.
科学家不花费时间研究打哈欠。那可能因为打哈欠不会伤害人，它只是我们做的某事。
Scientists do not spend time studying yawning, that is probably because yawning does not hurt. It is just something we do.
你在打哈欠。~你也在打哈欠。我们两个都累了。
结果是，尽管哈欠的传染性在人类中很常见，但没有证据显示乌龟打哈欠会传染。
The result is, her tortoises showed no evidence of contagious yawning, though it is common in humans.
当我们看到别人打哈欠的时候，我们也会跟着打哈欠。
据英国《每日邮报》报道，研究显示，有一半的研究对象在冬天打哈欠，在夏天打哈欠的仅有四分之一。
The researchers found that half of the study participants yawned in winter while only a quarter yawned in summer.
研究者发现，头上放了热水袋的参与者在看其他人打哈欠时，有41%的时候也会打哈欠，而头上放了冷水袋的只有9%。
Researchers have even found participants who place warm packs on their heads yawn 41% of the time while watching others yawn, as opposed to 9% with a cold pack on their head.
许多科学家认为打哈欠让你更加警觉。当你打哈欠时，你呼吸更深，你还伸展你脸部和脖子上的肌肉。
Some scientists believe that yawning makes you more a alert, when you yawn, you breathe more deeply, you also stretch your muscle in your face and your neck.
熊打哈欠，骆驼打哈欠，很多哺乳动物也打哈欠。我们为什么要打哈欠？实际上没有一个人知道答案。
Bears yawn, camels yawn, most mammals yawn. Why do we yawn.? No one really knows the answer.
为什么一个人打哈欠，房间内的其他人也都想打哈欠？
If one person yawns, why does everyone else in the room want to yawn?
我拍拍他的脑袋。为了防止她要为我为什么打哈欠会流泪，我赶紧先问他问题：“打哈欠是会流泪，你知道还有什么情况下会流泪吗？”
"I patted him on the head. in order to prevent her to me why yawning will shed tears, I hastened to ask him a question:" yawning can cry, you know what circumstances will shed tears?
我拍拍他的脑袋。为了防止她要为我为什么打哈欠会流泪，我赶紧先问他问题：“打哈欠是会流泪，你知道还有什么情况下会流泪吗？”
"I patted him on the head. in order to prevent her to me why yawning will shed tears, I hastened to ask him a question:" yawning can cry, you know what circumstances will shed tears?
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