n.乏味或枯燥的事物( yawn的名词复数 )；v.打呵欠( yawn的第三人称单数 )；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： yawnn.an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom"he co