他敞开睡衣站着打呵欠。
那天早上没有人有时间打呵欠。
那天也没人有时间打呵欠！
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.
他一边打呵欠，一边张开了一张像烤炉一样大的嘴。
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.
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。
我感到很困，止不住地打呵欠。
她不断打呵欠，暗示她累了。
打呵欠表示你困了或是累了。
她听讲座时一直在打呵欠。
看到孩子们在打呵欠，她就打发他们去睡觉了。
他揉揉眼睛打呵欠。
他的长篇大论烦死了，我来打呵欠暗示他一下。
I'm tried of his long stories . I'll give him a hint by yawning .
我是怎样地翻腾，打呵欠，打盹，又清醒过来！
我打呵欠伸懒腰。
一个人打呵欠，你会认为那个人对你的信息厌烦。
A person yawns and you believe that person is bored with your message.
我说的当然是实话咯，我感觉很好。(打呵欠)。
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.
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.
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