Those tiny， little hairs above our eyes that many women either pluck①，paint， pierce or tattoo② play a very important role in keeping moisture③ out of our eyes.
Just like an umbrella keeps our bodies dry from the rain， our hairy eyebrows keep our eyes dry from rain or sweat.
When it’s pouring rain outside or when sweat drips down from our foreheads， our eyebrows divert the flow of water or sweat away from our eyes.
Our arch-shaped eyebrows angle the rain or sweat around to the side of our faces-leaving our eyes fairly dry. By catching the water or sweat， our eyebrows not only allow us to see more clearly， but also keep salty sweat from burning or irritating④ our eyes.
Eyebrows have other roles also. As one of our most expressive facial features， eyebrows help us determine how people are feeling without ever really asking them.
If a person’s eyebrows are frowning⑤， chances are they are mad or upset. In addition， eyebrows have an increasing impact on our beauty or fashion culture over the years.
Thick， hairy and big eyebrows tend to be characterized as unattractive while thin and plucked eyebrows are said to be more attractive.
① pluckn. (一)拉，(一)拨，(一)扯[C]
② tattoon. 纹身花纹，刺花[C]
③ moisturen. 湿气，潮气，水分[U]
④ irritatev. 使恼怒，使烦躁
⑤ frownv. 皱眉，表示不满[(+at/on/upon)]
我们为何有眉毛
对于我们眼睛上方的那些细小毛发，许多女性都在对它进行拨 、染，、刺、纹等各种不辞劳苦的操作。但实际上，它在保护我们的眼睛免受潮湿方面起着非常重要的作用。
就如同雨伞可以在下雨时保护我们免受雨淋之苦一样，眉毛也可以保护我们的眼睛免受雨水或汗水打湿。
当外面下着大雨时，或汗水自我们额头流下时，眉毛可以将雨水或汗水引流，免得它们流入眼内。
由于眉毛呈弓形，所以可以将雨水或汗水引流到脸的旁侧，以保持眼睛的干燥。挡住雨水和汗水后，眉毛不仅使我们看东西更清楚，还可以防止眼睛被含有盐份的汗水刺激。
眉毛还有其它的作用，作为面部最有表现力的特征之一，我们不用开口，也可以通过眉毛来猜测对方的心理感受。如果对方皱眉，很可能意味着他不快或恼火。另外，近些年来眉毛还对人类的美容或流行文化有更强的影响。细长的眉毛比浓厚的眉毛据说更有吸引力。