你可以给一个因饥饿而打哈欠的可怜孩子一个便士吗？
Will you be kind enough to give a penny to a poor boy who is yawning from hunger?
而打哈欠就是其中一部分。
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.
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.
真正的问题在于，这其中究竟有没有什么生理学上的依据在起作用，而答案很可能是肯定的。科学家发现，就连黑猩猩之间，打哈欠也是会相互传染的。
The real question is whether there's actually something physiological at work here, and the answer is likely yes: even chimpanzees mimic each other's yawns.
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.
如此说来，也许张嘴打哈欠只是一种即将改变状态的信号，而不是疲倦本身的表现；由醒到睡，反之亦然。
Perhaps, then, an open mouth is more a sign of some impending change of state rather than a statement of tiredness itself; awake to asleep or vice versa.
作为打哈欠而不是思想模仿者的人(Homooscitans ratherthan sapiens)也许缺少尊严，却显示出其个性新的具有吸引力的一面。
Man as a yawning rather than thinking ape - Homo oscitans rather than sapiens - may lack dignity, but reveals a new and attractive side to his personality.
当别人一边听你侃侃而谈一边打哈欠的时候，你认为这是因为他们缺乏睡眠造成的。
You think that when people around you yawn, it's because they didn't get enough sleep.
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.
科学家发现，观看别人打哈欠时，那些被要求正常呼吸或用口呼吸的人有一半打哈欠；而被要求用鼻呼吸的人没有一个打哈欠。
Fifty per cent of people told to breathe normally or through their mouths yawned while watching other people yawn, while none of those told to breathe through their noses yawned.
虽然打哈欠在动物界广为流行，感染性的哈欠——由于看到别人打哈欠而引起的哈欠——之前仅仅在人类和黑猩猩中有发现。
Although yawning is widespread in many animals, contagious yawning - a yawn triggered by seeing others yawning - has previously only been shown to occur in humans and chimpanzees.
虽然打哈欠在动物界广为流行，感染性的哈欠——由于看到别人打哈欠而引起的哈欠——之前仅仅在人类和黑猩猩中有发现。
Although yawning is widespread in many animals, contagious yawning - a yawn triggered by seeing others yawning - has previously only been shown to occur in humans and chimpanzees.
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