她打着呵欠，舒适地转身侧向一边。
她伸开手臂，打了个大呵欠。
克鲁克的眼睑垂了下来，打起了呵欠。
他敞开睡衣站着打呵欠。
他装着打了一个呵欠。
她忍住了呵欠。
打呵欠会分散注意力，消耗精力，耗费时间。
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.
两个人随即打了个呵欠，印第安·乔说：“我困得要死了！”
Both men presently fell to yawning, and Injun Joe said: "I'm dead for sleep!"
最后，水鼠兰特打了一个大大的呵欠，说：“莫尔，老伙计，我快要倒了。”
At last the Rat, with a tremendous yawn, said, "Mole, old chap, I'm ready to drop."
希德打了个呵欠，伸了个懒腰，然后用胳膊肘支起身子，哼了一声，开始瞪着汤姆。
Sid yawned, stretched, then brought himself up on his elbow with a snort, and began to stare at Tom.
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.
他打呵欠打得下巴关节脱了臼。
我们知道你在想什么：想打呵欠吗？
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.
她张口打呵欠。
主要在早上和中午，老人比年轻人打的呵欠少。
Aged people yawn less than younger ones, mainly during morning and mid-afternoon.
呵欠连天的流浪汉们来了精神，就像狮子看见了饲养员。
看门人半露出身子，打着呵欠，似醒非醒，手中拿着蜡烛。
The porter half made his appearance yawning, vaguely awake, and with a candle in his hand.
他动弹了一下，然后睁开了眼睛，打了个呵欠，之后对我笑了笑。
He stirred and then opened his eyes. He yawned and then smiled at me.
现在他们明白了呵欠对于鸟类和哺乳类来说起到了散热器的作用。
It's now believed yawning operates like a radiator for birds and mammals.
“根据大脑冷却假设，我们认为存在一个气窗促使呵欠产生，”盖洛普说。
"Based on the brain cooling hypothesis, we suggest that there should be a thermal window in which yawning should occur," Gallup said.
科学家还猜测有羽毛的恐龙会生虱子，还认定呵欠在黑猩猩中也是会传染的。
Scientists also hypothesized that feathered dinosaurs had lice and determined that yawns are contagious among chimpanzees.
但是这项新的关于呵欠的研究改变了大众对呵欠的看法——只不过是无聊的表现。
But the new study on yawning changes the popular notion that yawns are mere signs of boredom.
工作时呵欠连天不仅仅效率低下，更糟的是，可能会引起严重的生产事故。
Nodding off at work isn't just unproductive; in the worst cases, it can cause serious industrial accidents.
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.
巧合的是，老盖洛普也是一名主持对呵欠和其他引发广泛关注的特质进行研究的专家。
The senior Gallup also happens to be a leading expert on the science of yawning and other widespread evolved traits.
呵欠还起到了使大脑状态过度顺畅的作用，比如从睡眠状态到清醒状态切换时。
Yawning additionally appears to facilitate transitional states of the brain, such as going from sleep to waking periods.
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