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SSS 2008-11-10

时间:2010-05-15 06:07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 Karen Hopkin. This will just take a minute.

 

Every year, scores of manatees1 are killed by boats in Florida’s waters. Their plight2 is an ecological3 concern. And everyone from marine4 biologists to Marge in an episode5 of the Simpsons has gotten on board to save the manatees. So far, the best idea they’ve come up with is posting speed limits for boaters that zip through Florida’s waterways. But local scientist Edmund Gerstein says that slowing boats down may do more harm than good.

According to Gerstein, manatees aren’t hit because they’re too slow to get out of the way. When they’re motivated, they can move about 21 feet in a second. Instead, he thinks that manatees can’t hear the boats coming. Gerstein’s found that manatees are deaf to the sort of low-frequency sounds produced by boat engines. Making boats move more slowly makes things worse, because the resulting sound is even harder for them to hear and the boats spend that much more time in the area. His results will be presented at the acoustical6 society meeting in Miami on November 13th.

Happily, Gerstein has designed an underwater alarm that, when attached to the front of a boat, tells manatees to move it. Which could lead Marge to say: [Marge Simpson voice] “I can believe how many manatees we saved today.”

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin.
 


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1 manatees 838c504e9733f033c37f82abeb0e60f1     
n.海牛(水生哺乳动物,体宽扁,尾圆,有鳃状肢)( manatee的名词复数 )
参考例句:
  • The manatees tamed quickly. 海牛很快地被驯服。 来自互联网
  • Gentle and slow moving, manatees are said to be the mythical mermaids of sailors' imaginations. 海牛游动温和而缓慢,被认为是海员遐想中富有神秘色彩的美人鱼。 来自互联网
2 plight 820zI     
n.困境,境况,誓约,艰难;vt.宣誓,保证,约定
参考例句:
  • The leader was much concerned over the plight of the refugees.那位领袖对难民的困境很担忧。
  • She was in a most helpless plight.她真不知如何是好。
3 ecological IrRxX     
adj.生态的,生态学的
参考例句:
  • The region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
  • Each animal has its ecological niche.每种动物都有自己的生态位.
4 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。
5 episode Titzy     
n.(作品的一段)情节,插曲,系列事件中之一
参考例句:
  • The episode was a huge embarrassment for all concerned.这段小插曲令所有有关人员都感到非常尴尬。
  • This episode remains sharply engraved on my mind.这段经历至今仍深深地铭刻在我的心中。
6 acoustical acoustical     
adj. 听觉的,声学的,音响学的
参考例句:
  • This system can set up acoustical resonances. 这种系统能产生共鸣。
  • The relevance of acoustical principles is by no means limited to sound and hearing. 声学原理并不仅仅适用于声音和听觉。
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