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。

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.

youdao

你可能会更频繁眨眼当你意识到你的呼吸变得更深的时候。

Your eyes might blink more often as you notice your breathing gets deeper than before.

youdao

随着你意识到了呼吸，它往往会自然地发生改变而变得更深。

As you become aware of the breath, it tends to change naturally and become deeper.

youdao