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哈欠——在人类身上发生最为频繁的生理现象之一,有史以来对它的解释都似乎有支支吾吾、语焉不详的倾向。牛津词典仅简单将其描述为因厌倦而生,而两本重要的
Yawns - one of the most frequent physical phenomena that occur in human beings, the explanations to it all seem to have tended to go without saying. The Oxford Dictionary simply describes it as boredom and two important ones