Respiratory System Text 1

 

课文(一):我们为什么打哈欠

困的时候,人会打哈欠;累的时候,人会打哈欠;对一件事情感到厌倦的时候,人也会打哈欠。如果你认为,打哈欠只是因为“困”、“累”或者“厌倦”那你就错了。

美国的两位大学教授,对“哈欠”进行了十多年的研究。他们发现,夜晚开车的司机常常打哈欠,认真看书和做作业的学生也会不停地打哈欠,可是很少有人在床上打哈欠。他们认为,打哈欠是人们觉得必须保持清醒的时候,身体的一种反应

打哈欠还可以起到“提神”的作用。紧张的学习或者工作,使血液中的氧气减少、二氧化碳增多,身体感到疲劳。通过打哈欠,人体可以吸入更多的氧气,排出更多的二氧化碳,减轻疲劳。所以,开始工作以前,打一个哈欠,可以增加血液中的氧气,提高大脑的活动能力。早晨起床的时候,打一个哈欠,可以使大脑从休息状态进入工作状态,为新的一天做好准备。

打哈欠也可以起到放松的作用。打一次哈欠的时间大约为6秒钟,这时候人的眼睛和耳朵都“停止工作”,神经、肌肉得到完全放松。因此,打哈欠可以使人在生理和心理上都得到休息,对人体具有重要的保护作用。

 

Chinese Part of Speech Pinyin English
打哈欠 (v) dǎ hāqian to yawn
厌倦 (v) yànjuàn to be tired of
清醒 (adj) qīngxǐng conscious, sober
反应 (n) fǎnyìng response
提神 (v) tíshén to refresh oneself
疲劳 (adj) píláo tired, exhausted
状态 (n) zhuàngtài state
神经 (n) shénjīng nerve

 

Text (1): Why do we yawn?

Sleepy people will yawn. When tired, people will yawn. People also yawn when they are tired of something. If you think yawning is just about being “sleepy,” “tired,” or “bored,” you’re wrong.

Two American university professors have been studying “yawning” for more than ten years. They found that drivers who drive at night often yawn, and students who read and do homework diligently also keep yawning, but few people yawn in bed. They think yawning is a reaction when people feel they have to stay awake.

Yawning can also serve as a “pick-me-up.” The intense study or work causes the blood oxygen to be reduced, the carbon dioxide to increase and the body to feel tired. By yawning, the body can breathe in more oxygen and emit more carbon dioxide to reduce fatigue. So, before starting work, a yawn can increase the oxygen in the blood and improve the activity of the brain. When you get up in the morning, a yawn can bring your brain from a resting state to a working state to prepare for the new day.

Yawning can also play a role in relaxing. A yawn time is about 6 seconds. At that time the person’s eyes and ears “stop working” and nerves and muscles relax. Therefore, yawning can help people rest physiologically and psychologically, which has an important protective effect on the human body.