yawnv.打呵欠；张开n.呵欠；<口>乏味的人（事）yawning reflex呵欠反射yawn for sb.(地狱)张着大口等着某人yawning moment方向力矩yawn out a good night打着呵欠道声晚安Yawning and stretching呵欠和伸懒腰Yawning is contagious.打呵欠是有感染性的.Yawning is often contagious打哈欠常易于感染。Yawning Helps Keep You Alert刺痛觉Yawn yawned his disapproval of表示意兴阑珊Yawning is often contagious.打哈欠常易于感染。