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SSS 2012-03-19

时间:2012-04-16 06:03来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 This is Scientific American 60 Second Science, I am  Christopher Intagliata, got a minute.

 
Scientists discover new species all the time—on the order of 15,000 a year. One of the latest additions to the tree of life is a new type of leopard1 frog. Which might sound unremarkable, except for where it was found: New York City.
 
But how does a frog go unnoticed in the Big Apple? Well even experts have a hard time telling this new species from its northern and southern cousins on looks alone. But the new guy has a different croak2, which raised ecologists' suspicions. So they tracked down four leopard frog populations with the unique call—including one within view of the Statue of Liberty—and took DNA3 samples.
 
As they suspected, the odd croakers weren't southern or northern leopard frogs, or even a mix. They had a genetic4 ancestry5 of their own—earning them new species status. Those results appear in the journal Molecular6 Phylogenetics and Evolution. 
 
The frogs are tough New Yorkers—the center of their range appears to be Yankee Stadium. But the researchers say that the urban amphibians7 face threats like pesticides8 and infectious diseases. Not to mention real-life games of Frogger.

点击收听单词发音收听单词发音  

1 leopard n9xzO     
n.豹
参考例句:
  • I saw a man in a leopard skin yesterday.我昨天看见一个穿着豹皮的男人。
  • The leopard's skin is marked with black spots.豹皮上有黑色斑点。
2 croak yYLzJ     
vi.嘎嘎叫,发牢骚
参考例句:
  • Everyone seemed rather out of sorts and inclined to croak.每个人似乎都有点不对劲,想发发牢骚。
  • Frogs began to croak with the rainfall.蛙随着雨落开始哇哇叫。
3 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。
4 genetic PgIxp     
adj.遗传的,遗传学的
参考例句:
  • It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
  • Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
5 ancestry BNvzf     
n.祖先,家世
参考例句:
  • Their ancestry settled the land in 1856.他们的祖辈1856年在这块土地上定居下来。
  • He is an American of French ancestry.他是法国血统的美国人。
6 molecular mE9xh     
adj.分子的;克分子的
参考例句:
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
7 amphibians c4a317a734a700eb6f767bdc511c1588     
两栖动物( amphibian的名词复数 ); 水陆两用车; 水旱两生植物; 水陆两用飞行器
参考例句:
  • The skin of amphibians is permeable to water. 两栖动物的皮肤是透水的。
  • Two amphibians ferry them out over the sands. 两辆水陆两用车把他们渡过沙滩。
8 pesticides abb0488ed6905584ea91347395a890e8     
n.杀虫剂( pesticide的名词复数 );除害药物
参考例句:
  • vegetables grown without the use of pesticides 未用杀虫剂种植的蔬菜
  • There is a lot of concern over the amount of herbicides and pesticides used in farming. 人们对农业上灭草剂和杀虫剂的用量非常担忧。 来自《简明英汉词典》
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