2013浙江高考英语-阅读-B-篇译文

1、BBelow is a selection from a popular science book.以下选自一本著名的科学书籍If blood is red, why are veins（静脉） blue? 如果血液是红的,为什么静脉是蓝色的呢？Actually, veins are not blue at all.事实上,静脉根本不是是蓝色的。They are more of a clear, yellowish color.它们更像是一种清澈的,偏黄色的一种颜色。Although blood looks red when its outside the body, when its sit

2、ting in the vein near the surface of the skin, its more of a dark reddish purple color.尽管血液看上去是红的当它流出身体外后，但是当它呆在靠近表皮的静脉里时，它更像是一种红的发紫的颜色。At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison.在适当的深度，这些充满血液的静脉比周边皮肤显现出浅红色，相比之下，

3、使它们看上去像蓝色。Which works harder, you heart or your brain? 那个工作强度更大，你的心脏还是你的大脑？That kind of depends on whether youre busy thinking or busy exercising.这种就要取决于你是忙于思考还是忙于运动。Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker.你的心脏工作强度在运动时强

4、度高到3倍以上，接着传送足够的血液，终身都在填满一个超级油轮。But in the long run, your brain probably tips it, because even when youre sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it.但从长远来看，你的大脑可能会推翻它，因为即使当你静静坐在那，你的大脑仍然正在使用比起你心脏多2倍多的能量，它用去4-5倍的血液量来完成。

5、Why do teeth fall out, and why dont they grow back in grown-ups? 为什么牙齿会掉，为什么成人长不出牙齿？Baby (or “milk”) teeth do not last long; they fall out to make bigger room for bigger, stronger adult teeth later on.乳牙不会长的太久；它们会脱落下来为了留下空间给之后的成人的大些，强健些的牙齿。Adult teeth fall our when they become damaged, decayed and i

6、nfected by bacteria.成人的牙齿会脱落当它们受到损伤和被细菌给侵蚀。Once this second set of teeth has grown in, youre done.一旦第二幅牙长好，你的牙齿也就这么定了。When theyre gone, they are gone.当它们掉落后，就不会再长出来了。This is because nature figures youre set for life, and what controls regrowth of your teeth switches off.这是因为你自身设定下的自然定数，而控制你牙齿再一次长出的机

7、制也随之关闭。Do old people shrink as they age? 老人会随着年龄的增长而萎缩么？Yes and no.即对也不对。Many people do get shorter as they age.很多人的确会随着年龄的增长而变矮。But, when they do, it isnt because theyre shrinking all over.但是，但他们真的变矮时，它不是全部因为他们萎缩了。They lose height as their spine（脊柱） becomes shorter and more curved due to disuse and

8、 the effect of gravity(重力).他们失去高度是因为他们的脊柱变短了和弯曲了，由于不恰当使用和在重力的影响下。 Many (but not all) men and women do lose height as they get older.很多（但不全是）男人和女人的确在他们变老后失去原先的身高。Men lose and average of 3-4 cm in height as they age, while women may lose 5 cm or more.当男人变老后，他们平均失去3-4厘米的身高，而女人则可能失去5厘米或者更多。If you live t

9、o be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again? No, because old people dont really shrink! It is not that they are growing backwards - their legs, arms and backbones getting shorter.如果你能活到200岁，你会持续保持萎缩直到你只有60厘米高，再次像一个小男孩似的？不会，因为老人不会真的萎缩。这不是因为他们的成

10、长在退化-他们的腿，手臂，脊骨正在变短。When they do get shorter, its because the spine has shortened a little.当它们变短时，是因为脊椎骨已经短了一点点。Or, more often, become more bent and curved.或者，更多是变得弯曲。Why does spinning make you dizzy（眩晕的）? 为什么旋转使你感到眩晕?Because your brain gets confused between what youre seeing and what youre feeling.

11、因为你的大脑在你正在看的和正在感觉之间变混了。The brain senses that youre spinning using special gravity-and-motion-sensing organs in your inner ear, which work together with your eyes to keep your vision balance stable.大脑的感知你在旋转时，使用了内耳内的特殊重力和移动感知的器官，它和你的眼睛一起来保持你的视觉上适度的平衡。But when you suddenly stop spinning the system goe

12、s out of control, and your brain thinks youre moving while youre not.但是当你突然停止旋转，这个系统将走向失控，你的大脑认为你正在移动而事实上你没有。Where do feelings and emotions come from? 感觉和情感从何而来？Mostly from an ancient part of the brain called the limbic system.绝大多数来自大脑一个古老的部分叫做淋巴系统。 All mammals have this brain area - from mice to do

13、gs, cats, and humans.所有的哺乳动物，从老鼠到狗，猫，或人类都有这片脑区域。So all mammals feel basic emotions like fear, pain and pleasure.所以所有的哺乳感觉基本的情感，比如说像害怕，疼痛和愉悦。But since human feelings also involve other, newer bits of the brain, we feel more complex emotions than any other animal on this planet.但是因为人类的感觉还包括其它，大脑中更新点的部分，我们比起在这个星球上其它的动物可以感觉更复杂的情感。If exercise wears you out, how can it be good for you?如果运动把你给透支了，这怎么还可能对你的身体有益？Because our bodies adapt to everything we do to them.因为我们的身体适应了我们对它们所做的所有事。And as far as your body is conc