【英语时差8,16】墨鱼：色盲伪装大师

Ya?l: Clever cephalopods and colorblind camouflage¹ champions---cuttlefish²!

Don: Easy on the alliteration³, Ya?l!

Y: OK, Don. Cuttlefish are cephalopods, relatives of squid and octopuses⁴, and are  masters of camouflage. Using unique skin pigment⁵ cells, cuttlefish can rapidly change   their skin color and pattern to blend in with the background. Amazingly, they do this   despite being totally colorblind!

D: How can you tell if a cuttlefish is colorblind?

Y: First, the color-sensing cells in the retinas of cuttlefish eyes are composed of only one  type of cone⁶ cell. Humans have three different types, each sensitive to a different   color of light. With only one cone type, you couldn't differentiate⁷ between different  colors.

     Then, using night-vision video, scientists at Woods Hole Marine⁸ Lab discovered that   cuttlefish even match their background at night, when there isn't enough light for color   vision. This suggests that it isn't necessary for the cuttlefish see colors in order to   match them.

     Finally, they put cuttlefish in tanks with a range of different checkerboard patterns to   see how well they could differentiate between different colors or brightness.

     When in front of a high-contrast background, like alternating dark and light squares,  the cuttlefish skillfully mimicked⁹ the checkered¹⁰ pattern. They also tried   checkerboards of different colors that were very similar in brightness. That is, colors   that would look the same shade of grey in a black and white photo. In front of these   low-contrast checkerboards, the cuttlefish just turned a single solid color.

     So it seems that cuttlefish camouflage themselves by matching light intensities¹¹ of   objects rather than their colors. But how they match colors so accurately¹² is still a   mystery. 

1 camouflage   

n./v.掩饰，伪装

参考例句：

• The white fur of the polar bear is a natural camouflage.北极熊身上的白色的浓密软毛是一种天然的伪装。
• The animal's markings provide effective camouflage.这种动物身上的斑纹是很有效的伪装。

2 cuttlefish   

n.乌贼，墨鱼

参考例句：

• I have no idea about how to prepare those cuttlefish and lobsters.我对如何烹调那些乌贼和龙虾毫无概念。
• The cuttlefish spurts out dark ink when it is in danger.乌鲗遇到危险的时候会喷出黑色液体。

3 alliteration   

n.（诗歌的）头韵

参考例句：

• We chose alliteration on the theory a little vulgarity enhances memory.在理论上我们选择有点儿粗俗的头韵来帮助记忆。
• It'seems to me that in prose alliteration should be used only for a special reason.依我看，在散文里，头韵只能在一定的场合使用。

4 octopuses   

章鱼( octopus的名词复数 )

参考例句：

• Snails and octopuses are molluscs. 蜗牛和章鱼是软体动物。
• Limpets, snails and octopuses are mollusks. 帽贝、蜗牛和章鱼都是软体动物。

5 pigment   

n.天然色素，干粉颜料

参考例句：

• The Romans used natural pigments on their fabrics and walls.古罗马人在织物和墙壁上使用天然颜料。
• Who thought he might know what the skin pigment phenomenon meant.他自认为可能知道皮肤色素出现这种现象到底是怎么回事。

6 cone   

n.圆锥体，圆锥形东西，球果

参考例句：

• Saw-dust piled up in a great cone.锯屑堆积如山。
• The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。

7 differentiate   

vi.(between)区分；vt.区别；使不同

参考例句：

• You can differentiate between the houses by the shape of their chimneys.你可以凭借烟囱形状的不同来区分这两幢房子。
• He never learned to differentiate between good and evil.他从未学会分辨善恶。

8 marine   

adj.海的；海生的；航海的；海事的；n.水兵

参考例句：

• Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
• When the war broke out,he volunteered for the Marine Corps.战争爆发时，他自愿参加了海军陆战队。

9 mimicked   

v.（尤指为了逗乐而）模仿( mimic的过去式和过去分词 )；酷似

参考例句：

• He mimicked her upper-class accent. 他模仿她那上流社会的腔调。 来自辞典例句
• The boy mimicked his father's voice and set everyone off laughing. 男孩模仿他父亲的嗓音，使大家都大笑起来。 来自辞典例句

10 checkered   

adj.有方格图案的

参考例句：

• The ground under the trees was checkered with sunlight and shade.林地光影交错。
• He’d had a checkered past in the government.他过去在政界浮沉。

11 intensities   

n.强烈( intensity的名词复数 )；（感情的）强烈程度；强度；烈度

参考例句：

• At very high intensities, nuclear radiations cause itching and tingling of the skin. 当核辐射强度很高时，它能使皮肤感到发痒和刺痛。 来自辞典例句
• They ask again and again in a variety of ways and intensities. 他们会以不同的方式和强度来不停地问，直到他得到自己想要的答案为止。 来自互联网

12 accurately   

adv.准确地，精确地

参考例句：

• It is hard to hit the ball accurately.准确地击中球很难。
• Now scientists can forecast the weather accurately.现在科学家们能准确地预报天气。