考研优美英语作文的背诵046
<p> <span word="Vision">Vision</span></p><p> <span word="Human">Human</span> <span word="vision">vision</span> <span word="like">like</span> <span word="that">that</span> <span word="of">of</span> <span word="other">other</span> <span word="primates">primates</span> <span word="has">has</span> <span word="evolvedin">evolvedin</span> <span word="an">an</span> <span word="arboreal">arboreal</span> <span word="environment">environment</span>. <span word="In">In</span> <span word="the">the</span> <span word="dense">dense</span> <span word="complex">complex</span> <span word="world">world</span> <span word="ofa">ofa</span> <span word="tropical">tropical</span> <span word="forest">forest</span>, <span word="it">it</span> <span word="is">is</span> <span word="more">more</span> <span word="important">important</span> <span word="to">to</span> <span word="see">see</span> <span word="well">well</span> <span word="than">than</span> <span word="todevelop">todevelop</span> <span word="an">an</span> <span word="acute">acute</span> <span word="sense">sense</span> <span word="of">of</span> <span word="smell">smell</span>. <span word="In">In</span> <span word="the">the</span> <span word="course">course</span> <span word="of">of</span> <span word="evolution">evolution</span> <span word="membersof">membersof</span> <span word="the">the</span> <span word="primate">primate</span> <span word="line">line</span> <span word="have">have</span> <span word="acquired">acquired</span> <span word="large">large</span> <span word="eyes">eyes</span> <span word="while">while</span> <span word="the">the</span> <span word="snout">snout</span> <span word="has">has</span> <span word="shrunk">shrunk</span> <span word="to">to</span> <span word="givethe">givethe</span> <span word="eye">eye</span> <span word="an">an</span> <span word="unimpeded">unimpeded</span> <span word="view">view</span>. <span word="Of">Of</span> <span word="mammals">mammals</span> <span word="only">only</span> <span word="humans">humans</span> <span word="and">and</span> <span word="some">some</span> <span word="primates">primates</span> <span word="enjoy">enjoy</span> <span word="color">color</span> <span word="vision">vision</span>. <span word="The">The</span> <span word="red">red</span> <span word="flag">flag</span> <span word="is">is</span> <span word="black">black</span> <span word="to">to</span> <span word="the">the</span> <span word="bull">bull</span>. <span word="Horses">Horses</span> <span word="live">live</span> <span word="in">in</span> <span word="a">a</span> <span word="monochrome">monochrome</span> <span word="world">world</span>. <span word="Light">Light</span> <span word="visible">visible</span> <span word="to">to</span> <span word="humaneyes">humaneyes</span> <span word="however">however</span> <span word="occupies">occupies</span> <span word="only">only</span> <span word="a">a</span> <span word="very">very</span> <span word="narrow">narrow</span> <span word="band">band</span> <span word="in">in</span> <span word="the">the</span> <span word="whole">whole</span> <span word="electromagnetic">electromagnetic</span> <span word="spectrum">spectrum</span>. <span word="Ultraviolet">Ultraviolet</span> <span word="rays">rays</span> <span word="are">are</span> <span word="invisible">invisible</span> <span word="to">to</span> <span word="humans">humans</span> <span word="though">though</span> <span word="ants">ants</span> <span word="and">and</span> <span word="honeybees">honeybees</span> <span word="are">are</span> <span word="sensitive">sensitive</span> <span word="to">to</span> <span word="them">them</span>.<span word="Humans">Humans</span> <span word="have">have</span> <span word="no">no</span> <span word="direct">direct</span> <span word="perception">perception</span> <span word="of">of</span> <span word="infrared">infrared</span> <span word="rays">rays</span> <span word="unlike">unlike</span> <span word="therattlesnake">therattlesnake</span> <span word="which">which</span> <span word="has">has</span> <span word="receptors">receptors</span> <span word="tuned">tuned</span> <span word="into">into</span> <span word="wavelengthslonger">wavelengthslonger</span> <span word="than">than</span> 0.7 <span word="micron">micron</span>. <span word="The">The</span> <span word="world">world</span> <span word="would">would</span> <span word="look">look</span> <span word="eerily">eerily</span> <span word="different">different</span> <span word="ifhuman">ifhuman</span> <span word="eyes">eyes</span> <span word="were">were</span> <span word="sensitive">sensitive</span> <span word="to">to</span> <span word="infrared">infrared</span></p><p> <span word="radiation">radiation</span>. <span word="Then">Then</span> <span word="instead">instead</span> <span word="of">of</span> <span word="the">the</span> <span word="darkness">darkness</span> <span word="of">of</span> <span word="night">night</span>, <span word="we">we</span> <span word="would">would</span> <span word="be">be</span> <span word="able">able</span> <span word="tomove">tomove</span> <span word="easily">easily</span> <span word="in">in</span> <span word="a">a</span> <span word="strange">strange</span> <span word="shadowless">shadowless</span> <span word="world">world</span> <span word="where">where</span> <span word="objects">objects</span> <span word="glowed">glowed</span> <span word="withvarying">withvarying</span> <span word="degrees">degrees</span> <span word="of">of</span> <span word="intensity">intensity</span>. <span word="But">But</span> <span word="human">human</span> <span word="eyes">eyes</span> <span word="excel">excel</span> <span word="in">in</span> <span word="other">other</span> <span word="ways">ways</span>. <span word="They">They</span> <span word="are">are</span> <span word="infact">infact</span> <span word="remarkably">remarkably</span> <span word="discerning">discerning</span> <span word="in">in</span> <span word="color">color</span> <span word="gradation">gradation</span>. <span word="The">The</span> <span word="color">color</span> <span word="sensitivity">sensitivity</span> <span word="of">of</span> <span word="normalhuman">normalhuman</span> <span word="vision">vision</span> <span word="is">is</span> <span word="rarely">rarely</span> <span word="surpassed">surpassed</span> <span word="even">even</span> <span word="by">by</span> <span word="sophisticated">sophisticated</span> <span word="technical">technical</span> <span word="devices">devices</span>.</p><p> 全文翻译：视觉</p><p> 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。</p>
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