双语有声阅读：视觉

Vision

 

Human vision like that of other primates² has evolved in an arboreal³ environment.In the dense⁴ complex world of a tropical forest, it is more important to see well than to develop an acute sense of smell. In the course of evolution members of the primate¹ line have acquired large eyes while the snout has shrunk to give the eye an unimpeded view. Of mammals only humans and some primates enjoy color vision.The red flag is black to the bull. Horses live in a monochrome world. Light visible to human eyes however occupies only a very narrow band in the whole electromagnetic spectrum⁵.Ultraviolet rays are invisible to humans though ants and honeybees are sensitive to them. Humans have no direct perception of infrared⁶ rays unlike the rattlesnake which has receptors tuned⁷ into wavelengths⁸ longer than 0.7 micron. The world would look eerily⁹ different if human eyes were sensitive to infrared radiation.Then instead of the darkness of night, we would be able to move easily in a strange shadowless world where objects glowed with varying degrees of intensity¹⁰. But human eyes excel in other ways. They are in fact remarkably¹¹ discerning in color gradation. The color sensitivity of normal human vision is rarely surpassed even by sophisticated technical devices.

 

视觉

 

人类的视觉，和其它灵长目动物的一样，是在丛林环境中进化出来的。 在稠密、复杂的热带丛林里，好的视觉比灵敏的嗅觉更加重要。 在进化过程中，灵长目动物的眼睛变大，同时鼻子变小以使视野不受阻碍。 在哺乳类动物中，只有人和一些灵长目动物能够分辨颜色。 红旗在公牛看来是黑色的，马则生活在一个单色的世界里。 然而，人眼可见的光在整个光谱中只占一个非常狭窄的频段。人是看不到紫外线的，尽管蚂蚁和蜜蜂可以感觉到。与响尾蛇不同，人也不能直接感受到红外线。 响尾蛇的感觉器可以感受波长超过 0.7 微米的光线。 如果人能感受到红外线的话，这世界看上去将十分不同，而且恐怖。 到那时，将与夜的黑暗相反，我们能轻易地在一个奇异的没有阴影的世界里走动。 任何物体都强弱不等地闪着光。 然而，人眼在其它方面有优越之处。 事实上，人眼对颜色梯度具有非凡的分辨能力。 普通人类的视觉感受色彩的灵敏程度，甚至连精密的技术装备都很难超越。

1 primate   

n.灵长类（目）动物，首席主教；adj.首要的

参考例句：

• 14 percent of primate species are highly endangered.14%的灵长类物种处于高度濒危状态。
• The woolly spider monkey is the largest primate in the Americas.绒毛蛛猴是美洲最大的灵长类动物。

2 primates   

primate的复数

参考例句：

• Primates are alert, inquisitive animals. 灵长目动物是机灵、好奇的动物。
• Consciousness or cerebration has been said to have emerged in the evolution of higher primates. 据说意识或思考在较高级灵长类的进化中已出现。

3 arboreal   

adj.树栖的；树的

参考例句：

• Man was evolved from an ancestor that was probably arboreal.人大概是从住在树上的祖先进化而来的。
• Koala is an arboreal Australian marsupial.考拉是一种澳大利亚树栖有袋动物。

4 dense   

a.密集的，稠密的，浓密的；密度大的

参考例句：

• The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
• The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。

5 spectrum   

n.谱，光谱，频谱；范围，幅度，系列

参考例句：

• This is a kind of atomic spectrum.这是一种原子光谱。
• We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。

6 infrared   

adj./n.红外线(的)

参考例句：

• Infrared is widely used in industry and medical science.红外线广泛应用于工业和医学科学。
• Infrared radiation has wavelengths longer than those of visible light.红外辐射的波长比可见光的波长长。

7 tuned   

adj.调谐的，已调谐的v.调音( tune的过去式和过去分词 )；调整；（给收音机、电视等）调谐；使协调

参考例句：

• The resort is tuned in to the tastes of young and old alike. 这个度假胜地适合各种口味，老少皆宜。
• The instruments should be tuned up before each performance. 每次演出开始前都应将乐器调好音。 来自《简明英汉词典》

8 wavelengths   

n.波长( wavelength的名词复数 )；具有相同的/不同的思路；合拍；不合拍

参考例句：

• I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话，因为我们俩完全不对路。 来自《简明英汉词典》
• Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句

9 eerily   

adv.引起神秘感或害怕地

参考例句：

• It was nearly mid-night and eerily dark all around her. 夜深了，到处是一片黑黝黝的怪影。 来自汉英文学 - 散文英译
• The vast volcanic slope was eerily reminiscent of a lunar landscape. 开阔的火山坡让人心生怪异地联想起月球的地貌。 来自辞典例句

10 intensity   

n.强烈，剧烈；强度；烈度

参考例句：

• I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
• The strike is growing in intensity.罢工日益加剧。

11 remarkably   

ad.不同寻常地，相当地

参考例句：

• I thought she was remarkably restrained in the circumstances. 我认为她在那种情况下非常克制。
• He made a remarkably swift recovery. 他康复得相当快。