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当我们感到疲劳或厌倦的时候,就会情不自禁地打几个哈欠。这是一种信号,它表明一个人竭力要适应新的环境。又如,人们在看完电影或电视后打哈欠是为了使自己从这些故事情节中,回到现实生活中来;早晨或久坐后打哈欠,是要使自己迅速清醒过来,振作精神;发困或入睡前打哈欠,则表示大脑皮质的活动将进入抑制状态。
When we feel tired or tired, we can not help but make a few yawns. This is a signal that one person is struggling to adapt to the new environment. In another example, people yawn after watching movies or television in order to bring themselves back into real life from these storylines; to yawn in the morning or after sedentary is to make themselves wake up quickly and cheer up; Sleepy or yawning before going to sleep, then the activity of the cerebral cortex will enter into a state of inhibition.