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

英语听力:自然百科 重现人间的斑驴

时间:2014-04-22 07:39来源:互联网 提供网友:gmeng   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)

 The plains zebra is a close relative of the quagga, extinct since 1883. But according to members of the Quagga Project in Cape1 Town, South Africa. The foal seen running with its herd2 of plains zebras is a quagga. His name's Harley and he was born in May of this year. Prior to this, the most quagga-like animal was born in 2005. Conservationists on the project have used selective breeding with southern plains zebras to try to recreate a subspecies that has been extinct for more than 100 years.

 
“The quagga, is actually a subspecies of the plains zebra. Therefore, the main gene3 pool still exists within the plains zebra.”
 
The selective breeding program uses plains zebras that have quagga-like traits, an approach that livestock4 and horse breeders have used for centuries.
 
“‘Cause (what) I understand is you cannot bring anything back from extinction5, but you can revive its best subspecies.”
 
It's an opinion shared by zoologist6 Peter Lyord, who says that other genetically7 coded features such as habitat adaptations, unique to the quagga could not be recreated in the new quagga breed.
 
“So it would be very unfair to say you have recreated the quagga, and there is also a danger. Er, and the danger is that you could create the wrong impression to people and say once an animal is extinct. Don't worry, we can always recreate it. This is a special set of circumstances. There are several subspecies. What these people are doing is they’re using one of the subspecies, er, and, its lack of striping in certain individuals to try and produce an animal that looks similar in external appearance to the quagga.”
 
Critics say it is impossible to know whether animals produced are true quagga, since they were never studied by modern science.  Aside from color and stripes, no other defining quagga characteristics, such as behavioral patterns or diet were ever noted8 and may have been lost to history.

点击收听单词发音收听单词发音  

1 cape ITEy6     
n.海角,岬;披肩,短披风
参考例句:
  • I long for a trip to the Cape of Good Hope.我渴望到好望角去旅行。
  • She was wearing a cape over her dress.她在外套上披着一件披肩。
2 herd Pd8zb     
n.兽群,牧群;vt.使集中,把…赶在一起
参考例句:
  • She drove the herd of cattle through the wilderness.她赶着牛群穿过荒野。
  • He had no opinions of his own but simply follow the herd.他从无主见,只是人云亦云。
3 gene WgKxx     
n.遗传因子,基因
参考例句:
  • A single gene may have many effects.单一基因可能具有很多种效应。
  • The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
4 livestock c0Wx1     
n.家畜,牲畜
参考例句:
  • Both men and livestock are flourishing.人畜两旺。
  • The heavy rains and flooding killed scores of livestock.暴雨和大水淹死了许多牲口。
5 extinction sPwzP     
n.熄灭,消亡,消灭,灭绝,绝种
参考例句:
  • The plant is now in danger of extinction.这种植物现在有绝种的危险。
  • The island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。
6 zoologist MfmwY     
n.动物学家
参考例句:
  • Charles darwin was a famous zoologist.查尔斯达尔文是一位著名的动物学家。
  • The zoologist had spent a long time living with monkeys.这位动物学家与猴子一起生活了很长时间。
7 genetically Lgixo     
adv.遗传上
参考例句:
  • All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
  • Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物
8 noted 5n4zXc     
adj.著名的,知名的
参考例句:
  • The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
  • Jim is noted for arriving late for work.吉姆上班迟到出了名。
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----------------------------
顶一下
(0)
0%
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