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SSS 2009-05-20

时间:2010-05-18 01:33来源:互联网 提供网友:木渐浅。   字体: [ ]
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This is Scientific American’s 60-second Science. I'm Adam Hinterthuer. Got a minute?       

The Komodo dragon is the largest living lizard1 and a fearsome predator2. It has long been thought that some of its hunting prowess was due to a mouth teeming3 with bacteria. An attack that didn't immediately kill the dragon’s victim, often a deer but sometimes a person, would cause fatal bacterial4 infections. But a report released May 18th by the Proceedings5 of the National Academy of Sciences finds a more likely cause of death. The animal has evolved a “sophisticated combined arsenal6 killing7 apparatus”.

First, the animal has razor-sharp serrated teeth, perfect for tearing flesh and causing massive wounds, but wait, there’s more. When the researchers performed an MRI of the dragon, they found in its jaws8 what they called the most structurally9 complex reptile10 venom11 gland12 known. The gland has openings between the lizard’s teeth and releases chemicals that both dilate13 blood vessels14 and prevent blood clotting15. The inevitable16 result is massive blood loss. This new information does help to clean up the foul-mouthed reputation of the Komodo dragon, but it is little solace17 for its unfortunate prey18.
Thanks for the minute for Scientific American's 60-Second Science. I'm Adam Hinterthuer.

"Would you tell us a little bit more about the Komodo dragon, Doctor?"
"Happy to.  The Komodo dragon is the world's largest living lizard. It's a ferocious19 kind of ora, found on the steep-sloped Island of Komodo, in the Lesser20 Sunda chain of the Indonesian Archipelago and the nearby islands of Rinca, Padar and Floras21."

“Where do they come from?"
 


点击收听单词发音收听单词发音  

1 lizard P0Ex0     
n.蜥蜴,壁虎
参考例句:
  • A chameleon is a kind of lizard.变色龙是一种蜥蜴。
  • The lizard darted out its tongue at the insect.蜥蜴伸出舌头去吃小昆虫。
2 predator 11vza     
n.捕食其它动物的动物;捕食者
参考例句:
  • The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
  • Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
3 teeming 855ef2b5bd20950d32245ec965891e4a     
adj.丰富的v.充满( teem的现在分词 );到处都是;(指水、雨等)暴降;倾注
参考例句:
  • The rain was teeming down. 大雨倾盆而下。
  • the teeming streets of the city 熙熙攘攘的城市街道
4 bacterial dy5z8q     
a.细菌的
参考例句:
  • Bacterial reproduction is accelerated in weightless space. 在失重的空间,细菌繁殖加快了。
  • Brain lesions can be caused by bacterial infections. 大脑损伤可能由细菌感染引起。
5 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
6 arsenal qNPyF     
n.兵工厂,军械库
参考例句:
  • Even the workers at the arsenal have got a secret organization.兵工厂工人暗中也有组织。
  • We must be the great arsenal of democracy.我们必须成为民主的大军火库。
7 killing kpBziQ     
n.巨额利润;突然赚大钱,发大财
参考例句:
  • Investors are set to make a killing from the sell-off.投资者准备清仓以便大赚一笔。
  • Last week my brother made a killing on Wall Street.上个周我兄弟在华尔街赚了一大笔。
8 jaws cq9zZq     
n.口部;嘴
参考例句:
  • The antelope could not escape the crocodile's gaping jaws. 那只羚羊无法从鱷鱼张开的大口中逃脱。
  • The scored jaws of a vise help it bite the work. 台钳上有刻痕的虎钳牙帮助它紧咬住工件。
9 structurally b9ab462aabf667bfba00ea360ed6c929     
在结构上
参考例句:
  • The house roof was (structurally) unsound. 这屋顶(结构)不牢固。
  • Pinhole on shot-hole damage is never structurally significant. 针孔和蛀洞所造成的危害对结构的影响不大。
10 reptile xBiz7     
n.爬行动物;两栖动物
参考例句:
  • The frog is not a true reptile.青蛙并非真正的爬行动物。
  • So you should not be surprised to see someone keep a reptile as a pet.所以,你不必惊奇有人养了一只爬行动物作为宠物。
11 venom qLqzr     
n.毒液,恶毒,痛恨
参考例句:
  • The snake injects the venom immediately after biting its prey.毒蛇咬住猎物之后马上注入毒液。
  • In fact,some components of the venom may benefit human health.事实上,毒液的某些成分可能有益于人类健康。
12 gland qeGzu     
n.腺体,(机)密封压盖,填料盖
参考例句:
  • This is a snake's poison gland.这就是蛇的毒腺。
  • Her mother has an underactive adrenal gland.她的母亲肾上腺机能不全。
13 dilate YZdzp     
vt.使膨胀,使扩大
参考例句:
  • At night,the pupils dilate to allow in more light.到了晚上,瞳孔就会扩大以接收更多光线。
  • Exercise dilates blood vessels on the surface of the brain.运动会使大脑表层的血管扩张。
14 vessels fc9307c2593b522954eadb3ee6c57480     
n.血管( vessel的名词复数 );船;容器;(具有特殊品质或接受特殊品质的)人
参考例句:
  • The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
  • All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
15 clotting 9eca3747f25ae6f0d50d00d5b71d5d7d     
v.凝固( clot的现在分词 );烧结
参考例句:
  • The study was also based only on the one anti-clotting drug. 所用抗血栓药物也仅限于一种。 来自互联网
  • A plasma protein that is converted into thrombin during blood clotting. 凝血原酶一种血浆蛋白质,在血液凝聚时转化成凝血''。'酵'。''''。'素'。''。 来自互联网
16 inevitable 5xcyq     
adj.不可避免的,必然发生的
参考例句:
  • Mary was wearing her inevitable large hat.玛丽戴着她总是戴的那顶大帽子。
  • The defeat had inevitable consequences for British policy.战败对英国政策不可避免地产生了影响。
17 solace uFFzc     
n.安慰;v.使快乐;vt.安慰(物),缓和
参考例句:
  • They sought solace in religion from the harshness of their everyday lives.他们日常生活很艰难,就在宗教中寻求安慰。
  • His acting career took a nosedive and he turned to drink for solace.演艺事业突然一落千丈,他便借酒浇愁。
18 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。
19 ferocious ZkNxc     
adj.凶猛的,残暴的,极度的,十分强烈的
参考例句:
  • The ferocious winds seemed about to tear the ship to pieces.狂风仿佛要把船撕成碎片似的。
  • The ferocious panther is chasing a rabbit.那只凶猛的豹子正追赶一只兔子。
20 lesser UpxzJL     
adj.次要的,较小的;adv.较小地,较少地
参考例句:
  • Kept some of the lesser players out.不让那些次要的球员参加联赛。
  • She has also been affected,but to a lesser degree.她也受到波及,但程度较轻。
21 floras 97bf4500b6bb5476f3163f3eb2f7fb51     
n.(某地区或某时期的)植物群,植物区系,植物志( flora的名词复数 )
参考例句:
  • Floristics is the study of floras, including the preparation of Floras. 植物区系学是研究植物区系的一门学科,其中包括编写植物志。 来自辞典例句
  • We shall appreciate this difficulty more clearly, by looking to certain existing faunas and floras. 通过观察某些现存的动物群和植物群,我们就能更清楚地了解这种困难了。 来自辞典例句
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