不幸的是，少数针对打哈欠的科学调查未能发现人们打哈欠的频率与他们睡觉时长和疲劳程度之间有任何联系。
Unfortunately, the few scientific investigations of yawning have failed to find any connection between how often someone yawns and how much sleep they have had or how tired they are.
她打哈欠是对我打哈欠的条件反射。
当你看到有人打哈欠时，你也会开始打哈欠，你知道这是怎么回事吗?
Do you know how it is when you see someone yawn and you start yawning too?
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