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SSS 2011-12-02

时间:2012-01-13 03:33来源:互联网 提供网友:gmeng   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 will just take a minute.
 
Bats see with their ears, which are highly attuned1 to pick up minute variations in the reflection of the sound pulses they use to echolocate. Here are some pulses, slowed down. 
 
And now researchers have shown that horseshoe bats can manipulate the shape of their ears in milliseconds to better catch those bouncing sound waves.
 
Horseshoe bats had been known to move their entire outer ear, or pinna. But scientists wondered whether the motion was a generalized swiveling of the entire ear—the way a cat can point its whole ear in a specific direction—or whether the bats could delicately manipulate the shape of the pinnae.
 
The researchers analyzed3 the pinnae with high-speed video and high-resolution imaging. And they found that the pinnae could move from upright to bent4 and back again within a tenth of a second, less than the blink of an eye. The study appeared in the journal Physical Review Letters. 
 
The changes in the deformation5 of the bats’ ears can correspond to different echolocation beam patterns, which might allow the bats to tune2 in to particular frequencies. And you thought wiggling your ears was impressive.
 
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 attuned df5baec049ff6681d7b8a37af0aa8e12     
v.使协调( attune的过去式和过去分词 );调音
参考例句:
  • She wasn't yet attuned to her baby's needs. 她还没有熟悉她宝宝的需要。
  • Women attuned to sensitive men found Vincent Lord attractive. 偏爱敏感男子的女人,觉得文森特·洛德具有魅力。 来自辞典例句
2 tune NmnwW     
n.调子;和谐,协调;v.调音,调节,调整
参考例句:
  • He'd written a tune,and played it to us on the piano.他写了一段曲子,并在钢琴上弹给我们听。
  • The boy beat out a tune on a tin can.那男孩在易拉罐上敲出一首曲子。
3 analyzed 483f1acae53789fbee273a644fdcda80     
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
参考例句:
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
4 bent QQ8yD     
n.爱好,癖好;adj.弯的;决心的,一心的
参考例句:
  • He was fully bent upon the project.他一心扑在这项计划上。
  • We bent over backward to help them.我们尽了最大努力帮助他们。
5 deformation 59ryp     
n.形状损坏;变形;畸形
参考例句:
  • The deformation frequencies are not sufficiently distinctive.其变形频率不是十分明显的。
  • The calculated deformation is almost equal to the real situation by measurement.经检测,计算变形量与实际情况基本一致。
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