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SSS 2009-01-09

时间:2010-05-17 01:59来源:互联网 提供网友:木渐浅。   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 Karen Hopkin. This will just take a minute.

 

Have you ever turned off your lights and heard [mosquito buzz]? To you it’s a sound that signals bites in the night. But to a male mosquito it’s a love song, produced by a female seeking a mate. Now scientists from Cornell University find that males who answer that call join in the serenade. And the two sing in harmony as they check each other out. [Mosquitoes buzzing.]

Working with Aedes aegypti mosquitoes—the pests that carry dengue fever—the scientists tethered individuals to a special insect pin and allowed them to fly past a potential mate. They found that females on their own whine1 at a frequency of 400 Hertz. Whereas single males buzz at about 600. But when the two come together, they perform a duet in which the beat of their wings reaches a frantic1200 hertz. [Tone.] Isn’t it beautiful? Mosquitoes seem to think so. Which is a surprise, because researchers had previously2 thought that female mosquitoes were deaf. But the Cornell scientists found that mosquito ears are good up to 2000 hertz, results published in the January 9th issue of Science. Maybe that harmonizing could be exploited for controlling mosquito populations. Releasing into the wild males that can’t sing could be a real buzz-kill.

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

 


点击收听单词发音收听单词发音  

1 whine VMNzc     
v.哀号,号哭;n.哀鸣
参考例句:
  • You are getting paid to think,not to whine.支付给你工资是让你思考而不是哀怨的。
  • The bullet hit a rock and rocketed with a sharp whine.子弹打在一块岩石上,一声尖厉的呼啸,跳飞开去。
2 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
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TAG标签:   SSS  harmony
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