|Chinese||Part of Speech||Pinyin||English|
|打哈欠||(v)||dǎ hāqian||to yawn|
|厌倦||(v)||yànjuàn||to be tired of|
|提神||(v)||tíshén||to refresh oneself|
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.