短语词组短语yawning reflex 呵欠反射yawning gulf 开口很大的鸿沟;口子很大的鸿沟Past yawning 打哈欠Frequent Yawning 数欠help yawning 帮助打哈欠While Yawning 而打哈欠yawning wearily 疲惫地打呵欠;打哈欠的疲劳yawning moment 方向力矩Yawning Fissure 豁口裂缝 返回 yawning