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SSS 2008-06-27

时间:2010-05-14 03:01来源:互联网 提供网友:0922013129   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science, I am Cynthia Graber. This'll just take a minute.

For the last five years, researchers have been analyzing1 bird DNA2. That effort has now completely altered our understanding of which bird species really do flock together in evolutionary3 history. The overall project is called Assembling the Tree of Life, with the avian part known as Early Bird. The new relationships appear in the June 27th issue of the journal Science. It turns out much of what we thought about how bird species were related to one another was just wrong. For example, scientists thought that birds that live on water, like flamingos4, evolved from a separate waterbird group. But flamingoes took to the water after speciating. And it might make sense to think that birds with similar lifestyles, like falcons5 and eagles, were related. Nope. Instead, falcons are more closely related to parrots. Rearchers found other surprising relatives—colorful hummingbirds6 that flit about when the sun shines descended7 from drab, nocturnal nightjars. Get ready for Latin species names to change. And textbooks and field guides will have to be revised to correct former assumptions about relationships. The 82 million American birdwatchers will certainly go cookoo.

 

Thanks for the minute for Scientific American's 60-Second Science, and I'm Cynthia Graber.

 


点击收听单词发音收听单词发音  

1 analyzing be408cc8d92ec310bb6260bc127c162b     
v.分析;分析( analyze的现在分词 );分解;解释;对…进行心理分析n.分析
参考例句:
  • Analyzing the date of some socialist countries presents even greater problem s. 分析某些社会主义国家的统计数据,暴露出的问题甚至更大。 来自辞典例句
  • He undoubtedly was not far off the mark in analyzing its predictions. 当然,他对其预测所作的分析倒也八九不离十。 来自辞典例句
2 DNA 4u3z1l     
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句:
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
3 evolutionary Ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
4 flamingos 8ff667734ac0706d98599e1f6b6f6f49     
n.红鹳,火烈鸟(羽毛粉红、长颈的大涉禽)( flamingo的名词复数 )
参考例句:
  • Flamingos stand in a salt lake in Larnaca, Cyprus. 塞浦路斯的拉纳卡市一个盐湖中的火烈鸟。 来自互联网
  • The research started researchers studied greater flamingos and in a bird sanctuary in southern Spain. 研究人员在西班牙南部的一个鸟类保护区对大型火烈鸟进行研究。 来自互联网
5 falcons 1090843cfc7d8664c201d9881ebf16b9     
n.猎鹰( falcon的名词复数 )
参考例句:
  • Peregrine falcons usually pluck the feathers and strip the flesh off their bird prey. 游隼捕到鸟类猎物时,通常是先拔掉它们的羽毛,再把肉撕下来。 来自《简明英汉词典》
  • Though he doubted the wisdom of using falcons, Dr. de la Fuente undertook the project. 虽然德·拉·富恩特博士怀疑使用游隼是否明智,但他还是执行了这项计划。 来自辞典例句
6 hummingbirds 86894f7ac4de81bc2d81331e9759a43b     
n.蜂鸟( hummingbird的名词复数 )
参考例句:
  • Hummingbirds have discovered that nectar and pollen are very nutritious. 蜂鸟发现花蜜和花粉是很有营养的。
  • Why do hummingbirds and gorillas both have backbones? 为什么蜂鸟和大猩猩都有脊骨?
7 descended guQzoy     
a.为...后裔的,出身于...的
参考例句:
  • A mood of melancholy descended on us. 一种悲伤的情绪袭上我们的心头。
  • The path descended the hill in a series of zigzags. 小路呈连续的之字形顺着山坡蜿蜒而下。
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