not normal breathing
呼吸不正常
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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
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