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英语听力：2013-05-22 完美捕食 Perfect Predators —9

时间：2014-02-12 06:15:39

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（单词翻译）

 And Sauroposeidon like most plant eaters are smelly. Unlike a meat eater, they produce huge amounts of waste, feces that form a trail marking everywhere they’ve been. For Deinonychus, that odor is a dead giveaway. And this carnivore’s eyes can clearly see prey1 from a great distance.

 
A scan of Deinonychus skull2 reveals a brain with an oversized optic nerve, the nerve which transmits visual information from the eyes. 
 
The optic nerve is very large, too. And the eye socket3 is very large. 
 
 
 
It’s like having a broadband connection between the eyes and the brain. This high-speed link means Deinonychus can react quickly to even subtle changes in its environment. 
 
If we look at the Deinonychus eye, it’s probably gonna be about an inch across, a lot of space in there for photoreceptors. It could see well at night. It would have just a superb sense of sight.
 
Unlike a mammal, Deinonychus has no blood vessels4 in its retina, what we see as red-eye in flash photographs. This simple design change creates space for many more rods and cones5 more than twice the number of photoreceptors found in the human retina. And the additional rods means Deinonychus can see in the dark as if looking through night-vision googles. 
 
This animal had very sensitive vision being able to actually discriminate6 objects with great clarity and acute vision. 
 
These are the characteristics of an alpha or apex7 hunter. Yet highly advanced senses aren’t their only weapon. Deinonychus is agile8 and can reach speeds of 60 kilometers per hour. And, it has almost-perfect balance. 
 
It would have been swift. It would have been swifter than a human being certainly, but its real ability would have been agility9. It’s a sort of animal that could probably turn on a dime10.

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1 prey g1czH     
n.被掠食者，牺牲者，掠食；v.捕食，掠夺，折磨
参考例句：
  • Stronger animals prey on weaker ones.弱肉强食。
  • The lion was hunting for its prey.狮子在寻找猎物。
2 skull CETyO     
n.头骨；颅骨
参考例句：
  • The skull bones fuse between the ages of fifteen and twenty-five.头骨在15至25岁之间长合。
  • He fell out of the window and cracked his skull.他从窗子摔了出去，跌裂了颅骨。
3 socket jw9wm     
n.窝，穴，孔，插座，插口
参考例句：
  • He put the electric plug into the socket.他把电插头插入插座。
  • The battery charger plugs into any mains socket.这个电池充电器可以插入任何类型的电源插座。
4 vessels fc9307c2593b522954eadb3ee6c57480     
n.血管( vessel的名词复数 )；船；容器；（具有特殊品质或接受特殊品质的）人
参考例句：
  • The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
  • All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
5 cones 1928ec03844308f65ae62221b11e81e3     
n.（人眼）圆锥细胞；圆锥体( cone的名词复数 )；球果；圆锥形东西；（盛冰淇淋的）锥形蛋卷筒
参考例句：
  • In the pines squirrels commonly chew off and drop entire cones. 松树上的松鼠通常咬掉和弄落整个球果。 来自辞典例句
  • Many children would rather eat ice cream from cones than from dishes. 许多小孩喜欢吃蛋卷冰淇淋胜过盘装冰淇淋。 来自辞典例句
6 discriminate NuhxX     
v.区别，辨别，区分；有区别地对待
参考例句：
  • You must learn to discriminate between facts and opinions.你必须学会把事实和看法区分出来。
  • They can discriminate hundreds of colours.他们能分辨上百种颜色。
7 apex mwrzX     
n.顶点，最高点
参考例句：
  • He reached the apex of power in the early 1930s.他在三十年代初达到了权力的顶峰。
  • His election to the presidency was the apex of his career.当选总统是他一生事业的顶峰。
8 agile Ix2za     
adj.敏捷的，灵活的
参考例句：
  • She is such an agile dancer!她跳起舞来是那么灵巧！
  • An acrobat has to be agile.杂技演员必须身手敏捷。
9 agility LfTyH     
n.敏捷，活泼
参考例句：
  • The boy came upstairs with agility.那男孩敏捷地走上楼来。
  • His intellect and mental agility have never been in doubt.他的才智和机敏从未受到怀疑。
10 dime SuQxv     
n.（指美国、加拿大的钱币）一角
参考例句：
  • A dime is a tenth of a dollar.一角银币是十分之一美元。
  • The liberty torch is on the back of the dime.自由火炬在一角硬币的反面。

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