It is an under-diagnosed, life-threatening lung disease that interferes with normal breathing and is not fully reversible.

该疾病是一种阻碍正常呼吸且诊断不足、威胁生命的肺病，是无法完全可逆的。

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He enriched the oxygen or the carbon dioxide in the air breathed by experimental subjects and found not a hint of suppression or exacerbation of yawning compared with control subjects breathing normal air.

WSJ: Matt Ridley on Why You Just Yawned | Mind & Matter