打哈欠可能通过周期性地降低肺部的压力来帮助清理肺部。
It might be that yawning helps to clear out the lungs by periodically lowering the pressure in them.
亦即那些转移你注意力的额外细节，比如别人的打哈欠或焦躁行为，可能会帮助你评估说话人所产生的真实的影响。
Or extra details that stole your attention, like others’ yawning and fidgeting, may help you assess the speaker’s real impact.
这两位研究人员表示，在打哈欠时，上颌窦的壁部(位于鼻子两边的脸颊上)像风箱一样弯曲，帮助大脑降温。
During yawning, the walls of the maxillary sinuses (located in the cheeks on each side of the nose) flex like bellows and help with brain cooling, according to the researchers.
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