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One of the least pleasant things about being human is the appearance at adolescence¹ of pimples².

最恼人的一件事就是青春期脸上长痘痘。

Not only do they make their entrance just at the time when people are most self-conscious, but they come and go for the rest of your life.

在人们最有自我意识的时候会冒痘痘，而且痘痘可能会在你脸上保留一辈子。

It would almost be better to have a hairy face.

也许脸上长满毛会更好。

Ironically, the general covering of our bodies in hair---what we call "fur" on other animals---is at the root of our problem with acne.

讽刺的是，我们身上的体毛，就是我们所说的其他动物的“皮毛”——就是我们脸上长粉刺的根源所在。

In the course of evolution human beings lost their entirely³ hairy faces and now have a lot of exposed skin there: even a bearded man with bushy eyebrows⁴ has much of his face bare.

在进化的过程中，人类完全失去了他们毛茸茸的面孔，进而暴露出大部分的皮肤：甚至是浓眉大眼的长满胡须的男人，他的脸都是光滑的。

The structures in the facial skin that once gave rise to hair, however, have not disappeared entirely: many still contain tiny vestigial hairs which do not grow.

面部皮肤结构一旦催生出毛发，就不能完全消失：很多还包含着微小残留的长不出来的毛发。

That means there is nothing to open up the pore itself; and that means the pore is a great place for oils, dirt and bacteria to get clogged⁵.

那就意味着和毛孔本身无关，而且意味着毛孔能被油脂，污垢和细菌堵塞。

You can get zits anywhere vestigial follicles become clogged.

残留毛囊堵塞的地方就会长有青春痘。

The big culprit on faces, though, isn't dirt so much as an internally-produced substance called sebum that makes the skin cells shed inside the pores.

不过脸部的罪魁祸首与其说是不干净，倒不如说是一种内部产生的物质，皮脂，使得皮肤毛孔内的细胞脱落。

These dead cells, unable to flake⁶ away, collect until they become an irritation⁷ to the pore.

这些死细胞，无法自动脱落，一直累积直到其对毛孔产生刺激作用。

At this point the body reacts in a miniature version of the way it deals with any other invasion: it sends white blood cells to the site to attack the invading body.

此时人体会减弱其他任何形式的入侵，从而它会将白细胞送至机体来抵抗受侵细胞。

The result is a mild inflammation at the scene of battle. That inflammation is the zit.

结果就是轻度炎症在作怪。而那炎症就是青春痘。

So evolution, while having cleaned our hairy faces, gave us pimply⁸ skin instead.

所以进化在清理我们多毛的面孔的同时，也会使我们的皮肤长有粉刺。

1 adolescence   

n.青春期，青少年

参考例句：

• Adolescence is the process of going from childhood to maturity.青春期是从少年到成年的过渡期。
• The film is about the trials and tribulations of adolescence.这部电影讲述了青春期的麻烦和苦恼。

2 pimples   

n.丘疹，粉刺，小脓疱( pimple的名词复数 )

参考例句：

• It gave me goose pimples just to think about it. 只是想到它我就起鸡皮疙瘩。
• His face has now broken out in pimples. 他脸上突然起了丘疹。 来自《简明英汉词典》

3 entirely   

ad.全部地，完整地；完全地，彻底地

参考例句：

• The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
• His life was entirely given up to the educational work. 他的一生统统献给了教育工作。

4 eyebrows   

眉毛( eyebrow的名词复数 )

参考例句：

• Eyebrows stop sweat from coming down into the eyes. 眉毛挡住汗水使其不能流进眼睛。
• His eyebrows project noticeably. 他的眉毛特别突出。

5 clogged   

（使）阻碍( clog的过去式和过去分词 )； 淤滞

参考例句：

• The narrow streets were clogged with traffic. 狭窄的街道上交通堵塞。
• The intake of gasoline was stopped by a clogged fuel line. 汽油的注入由于管道阻塞而停止了。

6 flake   

v.使成薄片；雪片般落下；n.薄片

参考例句：

• Drain the salmon,discard the skin,crush the bones and flake the salmon with a fork.将鲑鱼沥干，去表皮，粉碎鱼骨并用餐叉子将鱼肉切成小薄片状。
• The paint's beginning to flake.油漆开始剥落了。

7 irritation   

n.激怒，恼怒，生气

参考例句：

• He could not hide his irritation that he had not been invited.他无法掩饰因未被邀请而生的气恼。
• Barbicane said nothing,but his silence covered serious irritation.巴比康什么也不说，但是他的沉默里潜伏着阴郁的怒火。

8 pimply   

adj.肿泡的；有疙瘩的；多粉刺的；有丘疹的

参考例句：

• Now, we won't submit to impertinence from these pimply, tipsy virgins. 现在我们决不能忍受这群长着脓包、喝醉了的小兔崽子们的无礼举动。 来自辞典例句
• A head stuck out cautiously-a square, pimply, purplish face with thick eyebrows and round eyes. 车厢里先探出一个头来，紫酱色的一张方脸，浓眉毛，圆眼睛，脸上有许多小疱。 来自互联网