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SSS 2008-04-21

时间:2010-05-13 06:57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’m Adam Hinterthuer. Got a minute?

 You’ve probably heard about mercury contamination in fish. But a new study says that the toxin1 has climbed out of the water. Researchers from the College of William & Mary say landlubbing insects near the Shenandoah River have elevated levels of mercury in their blood, and so do the birds that eat them. The report appears in the April 18th issue of the journal Science. The scientists tested mercury in 13 insect-eating bird/ species and found that 12 had dangerously higher levels. They then examined the birds’ food supply-literally snatching spiders, moths2 and grasshoppers3 out of the mouths of babies in their nests. These tasty morsels4 all contained mercury. And spiders which sit higher up the insect food chain had even more mercury than fish collected from the river. The news is alarming since mercury can cause reproductive failure and even death at low  concentrations. The researchers now want to know how a problem thought to be confined to a single ecosystem5 is spreading. They speculate that contaminated aquatic6 insects or maybe polluted floodwaters are helping7 mercury creep out of the river and take to the wing.

 

Thanks for the minute for Scientific American’s 60-Second Science. I’m Adam Hinterthuer.

 


点击收听单词发音收听单词发音  

1 toxin hn5wb     
n.毒素,毒质
参考例句:
  • Experts have linked this condition to a build-up of toxins in the body.专家已把这一病症与体内毒素的积累联系起来。
  • Tests showed increased levels of toxin in shellfish.检验表明水生有壳动物的毒素水平提高了。
2 moths de674306a310c87ab410232ea1555cbb     
n.蛾( moth的名词复数 )
参考例句:
  • The moths have eaten holes in my wool coat. 蛀虫将我的羊毛衫蛀蚀了几个小洞。 来自《简明英汉词典》
  • The moths tapped and blurred at the window screen. 飞蛾在窗帘上跳来跳去,弄上了许多污点。 来自《现代英汉综合大词典》
3 grasshoppers 36b89ec2ea2ca37e7a20710c9662926c     
n.蚱蜢( grasshopper的名词复数 );蝗虫;蚂蚱;(孩子)矮小的
参考例句:
  • Grasshoppers die in fall. 蚱蜢在秋天死去。 来自《简明英汉词典》
  • There are usually a lot of grasshoppers in the rice fields. 稻田里通常有许多蚱蜢。 来自辞典例句
4 morsels ed5ad10d588acb33c8b839328ca6c41c     
n.一口( morsel的名词复数 );(尤指食物)小块,碎屑
参考例句:
  • They are the most delicate morsels. 这些确是最好吃的部分。 来自辞典例句
  • Foxes will scratch up grass to find tasty bug and beetle morsels. 狐狸会挖草地,寻找美味的虫子和甲壳虫。 来自互联网
5 ecosystem Wq4xz     
n.生态系统
参考例句:
  • This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
  • We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
6 aquatic mvXzk     
adj.水生的,水栖的
参考例句:
  • Aquatic sports include swimming and rowing.水上运动包括游泳和划船。
  • We visited an aquatic city in Italy.我们在意大利访问过一个水上城市。
7 helping 2rGzDc     
n.食物的一份&adj.帮助人的,辅助的
参考例句:
  • The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
  • By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
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