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托福听力短文 I-15-2

时间:2009-01-10 02:57来源:互联网 提供网友:Zoe-w   字体: [ ]
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    (单词翻译:双击或拖选)
(woman) This room is devoted1 to electric fish. The eel2 in the tank behind me can produce a strong jolt3 of electricity to stun4 its prey5, but most of the fish in here produce only weak electrical impulses that are useful for navigating6, locating food, and even for communicating.

The knife fish is a good example. This fish navigates7 using tiny receptors in the skin that are sensitive to electrical impulses. The knife fish produces an electrical signal, and the receptors in its skin let it know when the signal it distorted by a tree root, or some other obstacle, so it can go around it.

Fish also use the ability to produce and detect electrical impulses to communicate. They can tell each other what species they belong to, how big they are, and whether they're male or female. We have a tank here that's specially8 equipped to convert the inaudible signals the fish produce into sounds you can hear when you put on these headphones. I urge you all to listen in when I'm done speaking.

Now have a look at the electric rays. Rays are especially interesting to medical researchers because of the organs they use to produce electricity. These organs contain a chemical that carries signals from one nerve ending to the next, not only in rays, but also in people. By studying these organs, scientists hope to learn more about diseases that interrupt the transmission of impulses from one nerve to another.

点击收听单词发音收听单词发音  

1 devoted xu9zka     
adj.忠诚的,忠实的,热心的,献身于...的
参考例句:
  • He devoted his life to the educational cause of the motherland.他为祖国的教育事业贡献了一生。
  • We devoted a lengthy and full discussion to this topic.我们对这个题目进行了长时间的充分讨论。
2 eel bjAzz     
n.鳗鲡
参考例句:
  • He used an eel spear to catch an eel.他用一只捕鳗叉捕鳗鱼。
  • In Suzhou,there was a restaurant that specialized in eel noodles.苏州有一家饭馆,他们那里的招牌菜是鳗鱼面。
3 jolt ck1y2     
v.(使)摇动,(使)震动,(使)颠簸
参考例句:
  • We were worried that one tiny jolt could worsen her injuries.我们担心稍微颠簸一下就可能会使她的伤势恶化。
  • They were working frantically in the fear that an aftershock would jolt the house again.他们拼命地干着,担心余震可能会使房子再次受到震动。
4 stun FhMyT     
vt.打昏,使昏迷,使震惊,使惊叹
参考例句:
  • When they told me she had gone missing I was totally stunned.他们告诉我她不见了时,我当时完全惊呆了。
  • Sam stood his ground and got a blow that stunned him.萨姆站在原地,被一下打昏了。
5 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。
6 navigating 7b03ffaa93948a9ae00f8802b1000da5     
v.给(船舶、飞机等)引航,导航( navigate的现在分词 );(从海上、空中等)横越;横渡;飞跃
参考例句:
  • These can also be very useful when navigating time-based documents, such as video and audio. 它对于和时间有关的文档非常有用,比如视频和音频文档。 来自About Face 3交互设计精髓
  • Vehicles slowed to a crawl on city roads, navigating slushy snow. 汽车在市区路上行驶缓慢,穿越泥泞的雪地。 来自互联网
7 navigates 958df1f5bfaf5943d4890ea6c3cd4bd4     
v.给(船舶、飞机等)引航,导航( navigate的第三人称单数 );(从海上、空中等)横越;横渡;飞跃
参考例句:
  • Dolpins also navigates by some kind of echo system. 原来海豚也是借助某种回声系统寻向的。 来自辞典例句
  • Navigates in menus, lists, choice screens and into edited texts. 可以操纵菜单、列表、屏幕选项和进入编辑文本。 来自互联网
8 specially Hviwq     
adv.特定地;特殊地;明确地
参考例句:
  • They are specially packaged so that they stack easily.它们经过特别包装以便于堆放。
  • The machine was designed specially for demolishing old buildings.这种机器是专为拆毁旧楼房而设计的。
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