1. 打哈欠：替换的行为也会在行为去活化(Dearousal) 的时候没有得到适当的出口,而引起的激活状态下观察到,比如说打哈欠(Yawning)、吃(Eattingg)、发声(Vocalization)、以及自我修饰(Grooming).
2. 打呵欠：Why Do Baby Teeth Fall Out? 为什么乳牙会脱落? | Yawning 打呵欠 | Why Do People Yawn? 为什么会打呵欠?
3. yawning什么意思
3. 打呵尔：yao yang kuan 腰阳关 | yawning 打呵尔 | yeh men 液门
4. 公共查询·英语单词大全
4. 打哈欠crisis 危象：unconsciousness 失去知觉 | yawning 打哈欠crisis 危象 | auscultation 听诊
noun
1. an involuntary intake of breath through a wide open mouth
usually triggered by fatigue or boredom
e.g. he could not suppress a yawn
the yawning in the audience told him it was time to stop
he apologized for his oscitancy
adj
1. gaping open as if threatening to engulf someone or something
e.g. the yawning mine shaft
a yawning abyss
2. with the mouth wide open indicating boredom or sleepiness
e.g. a yawning congregation