英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

Earth and Sky:Electric Fish 发电鱼

时间:2007-07-30 07:52来源:互联网 提供网友:坤特奇   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)



Electric Fish 发电鱼

One way that Harold Zakon and his team find fish to study is to put electrical detectors1 into the bottom of murky2 streams in Venezuela. This works because certain fish emit pulses of electricity. Discover electric fish -- on today's Earth and Sky.

DB: This is Earth and Sky. You won't feel a shock. In fact, it takes a special instrument to detect the electric pulses made by a group of fish known as "weakly electric fish".

JB: Unlike eels3, which zap their prey4 with electricity, weakly electric fish use electricity to navigate5 and locate objects -- and other fish. Harold Zakon studies them at the University of Texas at Austin.

Harold Zakon: ... each species has a different pattern, each of the sexes within a species and each individual. If they approached another fish, they could detect its discharge and determine what species, sex and individual it was. If it was a member of their own species, they might even recognize it.

DB: The electrical pulses of these fish might provide some insight into the workings of the human brain. That's because human brains also work electrically. But electrical discharges made by fish are easier to study than the electricity in the brain.

Harold Zakon: You always have to crack the brain and stick an electrode in. Here, the animals just emit this signal, and we can watch these changes and infer what's going on in the membranes6 of their cells, just from their behavior.

JB: There's more about electric fish and human brains at today's show at earthsky.org. Thanks to the National Science Foundation -- where discoveries begin. We're Block and Byrd for Earth and Sky.

点击收听单词发音收听单词发音  

1 detectors bff80b364ed19e1821aa038fae38df83     
探测器( detector的名词复数 )
参考例句:
  • The report advocated that all buildings be fitted with smoke detectors. 报告主张所有的建筑物都应安装烟火探测器。
  • This is heady wine for experimenters using these neutrino detectors. 对于使用中微子探测器的实验工作者,这是令人兴奋的美酒。 来自英汉非文学 - 科技
2 murky J1GyJ     
adj.黑暗的,朦胧的;adv.阴暗地,混浊地;n.阴暗;昏暗
参考例句:
  • She threw it into the river's murky depths.她把它扔进了混浊的河水深处。
  • She had a decidedly murky past.她的历史背景令人捉摸不透。
3 eels eels     
abbr. 电子发射器定位系统(=electronic emitter location system)
参考例句:
  • Eels have been on the feed in the Lower Thames. 鳗鱼在泰晤士河下游寻食。
  • She bought some eels for dinner. 她买回一些鳗鱼做晚餐。
4 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。
5 navigate 4Gyxu     
v.航行,飞行;导航,领航
参考例句:
  • He was the first man to navigate the Atlantic by air.他是第一个飞越大西洋的人。
  • Such boats can navigate on the Nile.这种船可以在尼罗河上航行。
6 membranes 93ec26b8b1eb155ef0aeaa845da95972     
n.(动物或植物体内的)薄膜( membrane的名词复数 );隔膜;(可起防水、防风等作用的)膜状物
参考例句:
  • The waste material is placed in cells with permeable membranes. 废液置于有渗透膜的槽中。 来自辞典例句
  • The sarcoplasmic reticulum is a system of intracellular membranes. 肌浆网属于细胞内膜系统。 来自辞典例句
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   科普英语  earth  sky  electric  fish  科普英语  earth  sky  electric  fish
顶一下
(2)
100%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴