他敞开睡衣站着打呵欠。
他已经很多个小时没吃东西了，饿得开始打呵欠。
It was many hours since he had eaten anything and he started to yawn from hunger.
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.
打呵欠会分散注意力，消耗精力，耗费时间。
打呵欠最关键的诱因就是大脑的温度。
博茨瓦纳，打呵欠的狮子。
Yawning lion, Botswana. By Honour Schram DE Jong of Cuddington, bucks.
我们知道你在想什么：想打呵欠吗？
她张口打呵欠。
它打呵欠打得下巴关节拖了臼。
他一觉醒来，边打呵欠边伸懒腰。
他的冗长的故事听得我直打呵欠。
我感到很困，止不住地打呵欠。
格鲁：三只小猫开始打呵欠。
她听讲座时一直在打呵欠。
他揉揉眼睛打呵欠。
我是怎样地翻腾，打呵欠，打盹，又清醒过来！
在公共场所，张大嘴巴连连打呵欠，显示你极度厌倦。
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.
研究显示，打呵欠也会传染，黑猩猩能从卡通片里“学会”打呵欠。
Yawning is so contagious that chimpanzees can "catch" it from cartoons, according to research.
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.
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.
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.
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.
一会儿又说，“别这么打呵欠，伸懒腰，哈克贝里，为什么不学得规矩些？”
"And pretty soon she would say," don t gap and stretch like that, huckleberry - why don t you try to behave?
你就会过得很快活，免得像现在这样呆坐着，闲得无聊，只好看风景，打呵欠。
Then I shall know you're enjoying yourself, instead of sitting here idle, looking at the scenery and yawning your head off.
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.
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).
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.
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.
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