日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

您現在的位置: > Language Tips > Easy English > Odd Question  
 





 
Why do we have eyebrows?
[ 2006-07-21 11:11 ]

有人說眼睛是心靈的窗戶,那么眼眉就是窗戶的保護傘了。這把保護傘除了把人裝扮得更加靚麗外,還有非常大的實用價值。是什么呢?請看下文。

Eyebrows are a very significant aspect of our appearance. They are one of the most distinctive features that make up our faces, and we pay a lot of attention to them. We think of some types of eyebrows as attractive and some as unattractive, and many people spend as much time preening their eyebrows as they do applying makeup to their eyelashes or lips. Eyebrows are also one of our most expressive facial features. One of the clearest ways to tell somebody what you're thinking is to simply move your eyebrows up or down -- we all know what different eyebrow positions mean.

So, eyebrows obviously serve a lot of functions in our culture today -- beauty, nonverbal communication, distinctive appearance. But why are they there in the first place? As we evolved and lost most of the thick hair on our bodies, why did we keep that little bit over the eyes?

Scientists aren't entirely sure why we kept this hair, but they have a pretty good guess. We know that eyebrows help keep moisture out of our eyes when we sweat or walk around in the rain. The arch shape diverts the rain or sweat around to the sides of our face, keeping our eyes relatively dry. The most obvious advantage of this is that it lets us see clearly when we're sweating a lot or out in the rain. Without eyebrows, getting around in these conditions is a little more difficult. The shape of your brow itself diverts a certain amount of moisture, but eyebrows make a significant difference in your ability to see. Diverting the sweat away is also good because the salt in sweat irritates the eyes, making them sting a little.

There are a number of ways these qualities might have helped early man survive. Being able to see more clearly in the rain could certainly help you find shelter, and there are several circumstances when keeping the sweat out of your eyes could save your life. If you were trying to outrun a predator, for example, it's a good bet there would be a lot sweat running down your face. If all that sweat flowed right down into your eyes, you wouldn't be able to see that well, and your eyes would be irritated, which would certainly impair your ability to escape! Because of this slight survival advantage, nature would most likely select humans with eyebrows over humans without eyebrows.

predator:肉食動物

(英語點津 Annabel 編輯)

 
 

 

 

 
 

48小時內最熱門

     

本頻道最新推薦

     
  Why are moths attracted to light?
  Pamplola Bull-running Fiesta(西班牙奔牛節)
  Deaf-blind awareness week
  Hide-and-seek
  July 11






主站蜘蛛池模板: 亚洲三级av| 国产a级免费| 毛片网站在线看 | 成人性视频在线播放 | 色呦呦影院 | 永久免费毛片 | 国产精久久一区二区三区 | 男人深夜网站 | 福利片在线 | 男人久久| 大奶子在线观看 | 操操操操操 | 亚洲一区二区在线免费 | 国产精品男女 | 欧美中文字幕视频 | 成人在线视频网站 | 99精品久久 | 欧美精品在线播放 | 在线观看毛片网站 | 久久av一区| 精品日韩中文字幕 | av四虎| 久久国产精品免费观看 | 美国黄色网| 亚洲区av | 黄色大片免费在线观看 | 国产在线综合视频 | 日本黄色录像视频 | 国产精品情侣自拍 | 欧美性久久久 | 亚欧毛片 | 亚洲综合黄色 | 偷拍亚洲综合 | 91一区二区| 亚洲美女在线视频 | 日韩国产在线观看 | 亚洲狠狠 | 三级福利视频 | 亚洲乱熟 | 亚洲高清av在线 | 日本欧美在线观看视频 |