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SSS 2010-05-17

时间:2010-06-11 03:22来源:互联网 提供网友:swalloer   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 Cynthia Graber. This'll just take a minute.

How do baby coral find a new home in the open ocean? They listen—very closely—for reef sounds.

Scientists at the University of Bristol in England had already discovered in the last few years that baby fish who live among coral use sound to find the reefs. So they decided1 to check out the coral larvae2 themselves. These are tiny creatures, the size of a flea3.

The researchers created so-called choice chambers4. When the chambers were silent, the larvae floated about, equally distributed. But when the scientists played sounds of reefs, featuring the murmurs5 of fish and crustaceans6, the larvae swarmed7 toward the speakers.

What's even more interesting: fish larvae have anatomical features for detecting sound. But coral larvae have no such features. So how are they hearing? The researchers hypothesize that the sound waves are intercepted8 by cilia—hairlike structures—on the larvae. The work was published in the journal Public Library of Science ONE.

Here's why this is important. Coral reefs around the world are threatened. Coral larvae could be deterred9 by noise from human sources. So managing noise pollution could be one more angle in the effort to save the reefs.

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


点击收听单词发音收听单词发音  

1 decided lvqzZd     
adj.决定了的,坚决的;明显的,明确的
参考例句:
  • This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
  • There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
2 larvae w2CxP     
n.幼虫
参考例句:
  • Larvae are parasitic on sheep.幼虫寄生在绵羊的身上。
  • The larvae prey upon small aphids.这种幼虫以小蚜虫为食。
3 flea dgSz3     
n.跳蚤
参考例句:
  • I'll put a flea in his ear if he bothers me once more.如果他再来打扰的话,我就要对他不客气了。
  • Hunter has an interest in prowling around a flea market.亨特对逛跳蚤市场很感兴趣。
4 chambers c053984cd45eab1984d2c4776373c4fe     
n.房间( chamber的名词复数 );(议会的)议院;卧室;会议厅
参考例句:
  • The body will be removed into one of the cold storage chambers. 尸体将被移到一个冷冻间里。 来自《简明英汉词典》
  • Mr Chambers's readable book concentrates on the middle passage: the time Ransome spent in Russia. Chambers先生的这本值得一看的书重点在中间:Ransome在俄国的那几年。 来自互联网
5 murmurs f21162b146f5e36f998c75eb9af3e2d9     
n.低沉、连续而不清的声音( murmur的名词复数 );低语声;怨言;嘀咕
参考例句:
  • They spoke in low murmurs. 他们低声说着话。 来自辞典例句
  • They are more superficial, more distinctly heard than murmurs. 它们听起来比心脏杂音更为浅表而清楚。 来自辞典例句
6 crustaceans 37ad1a9eb8e9867969edd084ce8032d5     
n.甲壳纲动物(如蟹、龙虾)( crustacean的名词复数 )
参考例句:
  • These crustaceans provide a valuable food source for some fish. 这些甲壳纲动物是某些鱼类重要的食物来源。 来自《简明英汉词典》
  • When the tide ebbs it's a rock pool inhabited by crustaceans. 退潮时,它便成为甲壳动物居住的岩石区潮水潭。 来自辞典例句
7 swarmed 3f3ff8c8e0f4188f5aa0b8df54637368     
密集( swarm的过去式和过去分词 ); 云集; 成群地移动; 蜜蜂或其他飞行昆虫成群地飞来飞去
参考例句:
  • When the bell rang, the children swarmed out of the school. 铃声一响,孩子们蜂拥而出离开了学校。
  • When the rain started the crowd swarmed back into the hotel. 雨一开始下,人群就蜂拥回了旅社。
8 intercepted 970326ac9f606b6dc4c2550a417e081e     
拦截( intercept的过去式和过去分词 ); 截住; 截击; 拦阻
参考例句:
  • Reporters intercepted him as he tried to leave the hotel. 他正要离开旅馆,记者们把他拦截住了。
  • Reporters intercepted him as he tried to leave by the rear entrance. 他想从后门溜走,记者把他截住了。
9 deterred 6509d0c471f59ae1f99439f51e8ea52d     
v.阻止,制止( deter的过去式和过去分词 )
参考例句:
  • I told him I wasn't interested, but he wasn't deterred. 我已告诉他我不感兴趣,可他却不罢休。
  • Jeremy was not deterred by this criticism. 杰里米没有因这一批评而却步。 来自辞典例句
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TAG标签:   SSS  larvae
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