詞根:yawn
n.yawn 哈欠;裂口
vi.yawn 打呵欠;裂開
vt.yawn 張開;打著呵欠說
1.The empirical evidence, such as it is, suggests an altogether different function for yawning—namely, that yawning prepares us for a change in activity level.
很多實驗證據(jù)證實了打哈欠的另一個不同的功能,它能讓我們做好準(zhǔn)備,改變活動狀態(tài)。
2.A growing body of research now shows that yawning is nature's way of keeping our brains cool.
越來越多的研究表明,打哈欠是一種讓大腦保持冷靜的自然方式。
3.It might be that yawning helps to clear out the lungs by periodically lowering the pressure in them.
打哈欠可能通過周期性地降低肺部的壓力來幫助清理肺部。
6.Volunteers were told to think about yawning while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.
當(dāng)志愿者在正常的空氣中、純氧的環(huán)境下,或者混有超過正常的二氧化碳含量的空氣中呼吸時,他們被要求要想著打哈欠。
7.Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.
對于打哈欠是由血液中的氧氣減少或血液中的二氧化碳增加引起的這種觀點,一些實驗也同樣提出了嚴重的質(zhì)疑。