Without the sun, no living thing could survive on Earth, including humans. The sun allows food to grow and helps your body produce vitamin D. Why, then, does this life-giving star also make you feel tired? Perhaps you’ve wondered this after spending a day in the sun, and ending up completely exhausted.
There are several reasons why direct sunlight tires you out. The first is that your body doesn’t want to heat up. Therefore, it has to use a lot of energy to cool itself down and maintain its ideal temperature, 37°C. It does this by sending blood to your skin’s surface and by sweating. If you feel extremely tired in the sun, it’s a sign that it’s time to take a rest and cool down lest you suffer heatstroke or even die.
Another factor is dehydration, or lack of water. When you sweat a lot, your body loses water. As a result, your blood becomes thicker, which makes it harder for your heart to pump, meaning that less oxygen will be delivered to your body. This reduction of oxygen will make you feel even more tired. This is why it is so important to drink lots of water when you spend time in the sun. Yet another factor is sunburn, which is your skin’s reaction to the UV (ultraviolet) rays in sunlight. Your skin turns red as a form of protection, but this process is also tiring for your body’s immune system.
Photo courtesy of Shutterstock 照片：Shutterstock提供
As you can see, the sun is both your enemy and friend. Exposing yourself to its warming rays on a daily basis is good for you. But tiredness is your body’s way of telling you when it has had enough sunlight for the day.
What Did You Learn?
1. What is the main idea of the passage?
(A) Sunburn is a sign that your body is healthy.
(B) There are health benefits to getting enough sunlight.
(C) Any direct exposure to the sun is bad for your body.
(D) Tiredness serves as a warning that you’re getting too much sun.
2. Which of the following is NOT a reason why the sun tires you out?
(A) It forces your body to use energy to avoid overheating.
(B) It makes your skin burn, which requires energy.
(C) It increases the level of oxygen in your blood.
(D) It causes a reduction of water in your body.
3. Why does the author call the sun an enemy and a friend?
(A) Sunlight feels warm but actually cools your body.
(B) The sun is good for you, but it can also be harmful.
(C) People want to enjoy the sun every day but shouldn’t.
(D) The sun actually does more harm than good to humans.
答案：1. (D) 2. (C) 3. (B)
Words in Use
1. survive vi. 存活、生存
Most underwater organisms cannot survive on land.
2. sweat vi. 流汗、出汗
After running for five minutes under the sun, the students started to sweat.
3. extremely adv. 非常地、極端地
Molly was extremely excited when she found out that her favorite singer won the award.
4. lest conj. 以免（與助動詞should並用，should可省略）
Luke always takes the first bus to work lest he (should) be late.
5. suffer vt. 遭受、蒙受（一時的痛苦或損失）
The farmers suffered great losses because of the typhoon.
1. end up + 形容詞 結果／最後…
Larry invested all of his money in a company and hoped to make a fortune, but he ended up poor.
2. tire sb out 使某人筋疲力盡／疲憊不堪
Climbing such high mountains really tires me out.
3. heat up 變熱；加熱（溫度）
I bought a waffle maker last week, but it won’t heat up after I used it twice.
4. cool... down / cool down... 使…變涼／降溫
Jerry turned on the air conditioner to cool down his room.
5. lack of sth 缺乏…
Lack of experience was the main reason why Trevor didn’t get the job.
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