博茨瓦纳，打呵欠的狮子。
Yawning lion, Botswana. By Honour Schram DE Jong of Cuddington, bucks.
在冬天，当室外平均温度21度时，45%的人看到别人打呵欠的图片时自己也会打哈欠。
In the winter, when outdoor temperatures averaged 21 degrees, 45 per cent of people responded to the images by yawning themselves.
研究人员发现，在看别人打呵欠的视频时，用鼻子呼吸的人比用口腔呼吸的人打呵欠的几率要小。
The researchers found that those who breathed through the nose rather than the mouth were less likely to yawn when watching a video of other people yawning.
如果你的头脑过热，那么很有可能很快就打个呵欠。根据一项新的研究表明，打呵欠的主要原因就是控制大脑温度。
If your head is overheated, there's a good chance you'll yawn soon, according to a new study that found the primary purpose of yawning is to control brain temperature.
科学家研究发现，当人的大脑开始出现过热时，打呵欠的动作就充当天然的“自动调温器”，让清凉的空气进入大脑，使大脑温度恢复到健康水平。
When the head begins to heat up, yawning acts as a natural "thermostat" by allowing cool air to rush in and bring the brain back down to a healthy temperature, research suggests.
另一种完全不同的理论认为，打呵欠有助于生命早期肺部的生理发育，但对成年人没有任何剩余的生理功能。
A completely different theory holds that yawning assists in the physical development of the lungs early in life, but has no remaining biological function in adults.
另外，在极度寒冷的时候打呵欠也许不大合适，因为这时通常会将冷空气送到大脑，从而使大脑发生热冲击。
In addition, yawning when it is extremely cold may be maladaptive, as this may send unusually cold air to the brain, which may produce a thermal shock.
这表明打呵欠是因为大脑温度升高所触发的，且“实际上促进了大脑降温”盖洛普说。
This suggests yawns are triggered by an increase in brain temperature and "actually promote brain cooling," Gallup said.
他还进一步补充说，此前在鼠类身上实验的结果表明，打呵欠是由大脑温度急剧升高引起，而打呵欠后大脑温度又会骤然下降。
A previous study in rats showed that yawning was triggered by rapid increases in brain heat and was followed by a sudden drop in temperature, he added.
打呵欠最关键的诱因就是大脑的温度。
打呵欠不仅是疲劳或厌倦的信号——根据科学家的最新发现，它还是人体用来自动调节大脑温度的一种手段。
Yawning is not just a sign of tiredness or boredom - it is the body's method of keeping our brain cool, scientists have found.
不仅婴儿和新生儿有呵欠行为，就连12 -14周的胎儿也会打呵欠。
It has not only been observed in infants and in newborns, but also in fetuses of 12-14 weeks' gestational age.
再没有比对称的格局更令人感到难受的了，因为对称的形象能使人愁闷，愁闷是悲伤的根源，失望的人爱打呵欠。
It is because symmetry is ennui, and ennui is at the very foundation of grief. Despair yawns.
这与“打呵欠是疲倦的一种表现，促使人进入睡眠状态”的普遍看法正好相反。
This goes counter to a common view that yawning means tiredness and facilitates people to fall asleep.
打呵欠使人在不由自主张开嘴的同时，能长长的、深深的吸一口气。
Yawning involves opening the mouth involuntarily while taking a long, deep breath of air.
在昏暗拥挤的教室里，我注意到有位学生打呵欠并伸展四肢，抱怨这节课太简单和无聊了。
In the dim cramped classroom, I noticed a student who yawned and stretched his arms and legs, and complained how simple and boring the class was.
卧室外的一个巨大震动现场封闭窗帘地方，就好像有无数小精灵仙童在工作，我们打呵欠，伸展，什么都不知道。
Outside the closed curtains of the bedroom a vast transfbrmation scene is takiag place, just as if a myriad elves and brownies were at work, and we turn and yawn and stretch and know nothing about it.
事实上，合著者哈克期望打呵欠大脑降温理论“非常有争议性——我们正在探究的是一个未知领域。”
Indeed, co-author Hack expects the brain-cooling yawning theory to be "very controversial—we're delving into an area that's not well understood."
你呼吸减慢，心跳放缓，开始打呵欠，所有这些都是身体为睡眠做准备，这样睡眠的时候身体才会尽快地得到休息恢复。
Your breathing slows, your heart slows, and you may start to yawn... all of these things are preparations the body is making for sleep, so that it can get to work on repairs as soon as possible.
当约翰在他座位上伸懒腰打呵欠，即使那天你休息的很好你也会受到干扰。
It annoys you when John makes an unusually long grunt when he yawns and stretches at his desk even when you're well rested.
他的冗长的故事听得我直打呵欠。
在窗帘紧拉的卧室外面景色正发生着巨大的变化，就好像有无数小精灵和小仙童在工作，我们打呵欠，伸展腰腿却全然不知发生的一切。
Outside the closed curtains of the bedroom a vast transformation scene is taking place, just as if a myriad elves and brownies were at work, and we turn and yawn and stretch and know nothing about it.
比如说打呵欠也是会传染的，再比如说我们的情绪、面部表情、记忆、办公室的活力，乃至全球银行系统，都容易受到传染力量的影响。
Our yawns, our moods, our facial expressions, our memories, our office dynamics, our global banking system are all subject to the forces of contagion, it would seem.
你有没有这样的经历，当你看到别人打呵欠时，你也会不由自主地打起呵欠来？
Haven't you watched someone yawn and suddenly felt your own mouth gape open.
“今天的讲座令人厌味。我担心我要打呵欠了。那就太糟糕啦！”(打呵欠)。
"I was so bored with today's lecture. I was worried I'd start catching flies. That would have looked terrible!" (Yawning).
“今天的讲座令人厌味。我担心我要打呵欠了。那就太糟糕啦！”(打呵欠)。
"I was so bored with today's lecture. I was worried I'd start catching flies. That would have looked terrible!" (Yawning).
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