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。
那天早上没有人有时间打呵欠。
那天也没人有时间打呵欠！
最后，他叹了口气，打了个呵欠，就放弃了。
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.
你有没有在别人面前打呵欠，结果对方也打呵欠？
Have you ever yawned in front of someone, only to have them yawn right back?
他一边打呵欠，一边张开了一张像烤炉一样大的嘴。
打呵欠对他们的生理活动状态没有什么特殊的影响。
Yawning did nothing special to their state of physiological activity.
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!"
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.
打呵欠最关键的诱因就是大脑的温度。
打个呵欠，如果你愿意，请再翻一页。
打个呵欠，如果你愿意，请再翻一页。
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.
它打了一个呵欠，又继续洗脸。
看到孩子们在打呵欠，她就打发他们去睡觉了。
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.
我打呵欠伸懒腰。
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.
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.
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