1·The occupants of the rooms are yawning, or else scratching themselves.
房间里的人在打哈欠，或者在替自己搔痒。
2·Support for this theory came from a study of yawning behavior in everyday life.
这一理论的支撑来自对日常生活中打哈欠行为的研究。
3·Will you be kind enough to give a penny to a poor boy who is yawning from hunger?
你可以给一个因饥饿而打哈欠的可怜孩子一个便士吗？
4·A growing body of research now shows that yawning is nature's way of keeping our brains cool.
越来越多的研究表明，打哈欠是一种让大脑保持冷静的自然方式。
5·It has been suggested that yawning and hiccupping might serve to clear out the fetuses airways.
有人提出，打哈欠和打嗝可能有助于清理胎儿的气道。
1·He stood yawning, his pyjama jacket gaping open.
他敞开睡衣站着打呵欠。
—— 《牛津词典》
2·Yawning is distracting, consumes energy and takes time.
打呵欠会分散注意力，消耗精力，耗费时间。
3·Yawning did nothing special to their state of physiological activity.
打呵欠对他们的生理活动状态没有什么特殊的影响。
4·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.
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。
5·Yawning is not just a sign of tiredness or boredom - it is the body's method of keeping our brain cool, scientists have found.
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。