v.打呵欠( yawn的过去式和过去分词 )；张开，裂开； 双语释义：v.(动词)vi. & vt. 打呵欠 take a deep breath with the mouth wide open as sleepy or bored英英释义： yawn[ jɔ:n ]n.an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom"he could not suppre