vi.打呵欠；张开，裂开；张开大口；n.呵欠；无聊的人或事；裂口； 变形： 复数：yawns过去式：yawned过去分词：yawned现在分词：yawning第三人称单数：yawns 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; usual