| 释义 |
哈欠hā·qiɑn困倦时嘴张开,深深吸气,然后呼出,是血液内二氧化碳增多,刺激脑部的呼吸中枢而引起的生理现象{yawn; take (usu. involuntarily) a deep breath with the mouth wide open, as when sleepy or bored — a physiological phenomenon caused by increased carbon dioxide in the blood stimulating the respiratory centre in the brain}:
打～。{yawn; give a yawn} |