When you see someone yawn, you also yawn, many people say that they yawn because they are very bored, or tired.
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Some scientists believe that yawning makes you more a alert, when you yawn, you breathe more deeply, you also stretch your muscle in your face and your neck.
许多科学家认为打哈欠让你更加警觉。当你打哈欠时，你呼吸更深，你还伸展你脸部和脖子上的肌肉。
It is said that yawning is infectious, that is to say when you see other people yawn at the time, will also follow up their involuntary yawn come.
据说打哈欠是可以传染的，也就是说当你看到别人在打哈欠的时候，也会不由自主的跟着打起哈欠来。
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