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SSS 2010-12-03

时间:2011-01-06 06:00来源:互联网 提供网友:tianshun   字体: [ ]
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    (单词翻译:双击或拖选)

They’re everyone’s worst nightmare when it comes to swimming in the ocean: great white sharks. That’s despite the fact that the number of fatal shark attacks annually1 can usually be counted on the fingers of one still attached hand. But a new study finds that until great whites get at least three meters long, they’re less and more. Because a full-force bite could wind up hurting them.

In research published in the Journal of Biomechanics, scientists used 3-D computers models and advanced engineering techniques to study how sharks hunt and kill their food.

Great whites have jaws2 and teeth that are perfect for a powerful chomp3 on prey4 ranging from small fish to large marine5 mammals. But the researchers were surprised to find that a shark less than three meters long only looks like it could manage that killer6 bite. Because it has not developed enough stiff, mineralized cartilage yet. A bite that would be lethal7 to a large marine mammal could damage the shark’s jaws.

The finding may explain why the few shark attacks that do happen on people are rarely fatal—until it’s pretty big, the great white’s reputation is worse than its bite.

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


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1 annually VzYzNO     
adv.一年一次,每年
参考例句:
  • Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
  • They celebrate their wedding anniversary annually.他们每年庆祝一番结婚纪念日。
2 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。
3 chomp NrAzV     
v. (人、动物进食时)大声地咬,嚼得很响
参考例句:
  • I lost a tooth while chomping on a French baguette!我啃法棍面包时,崩掉了一颗牙!
  • They just chomp on tundra, nap a few hours and feast again.它们只是在苔原上大嚼特嚼,睡上几小时,接着再吃。
4 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。
5 marine 77Izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • When the war broke out,he volunteered for the Marine Corps.战争爆发时,他自愿参加了海军陆战队。
6 killer rpLziK     
n.杀人者,杀人犯,杀手,屠杀者
参考例句:
  • Heart attacks have become Britain's No.1 killer disease.心脏病已成为英国的头号致命疾病。
  • The bulk of the evidence points to him as her killer.大量证据证明是他杀死她的。
7 lethal D3LyB     
adj.致死的;毁灭性的
参考例句:
  • A hammer can be a lethal weapon.铁锤可以是致命的武器。
  • She took a lethal amount of poison and died.她服了致命剂量的毒药死了。
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