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SSS 2008-10-31

时间:2010-05-15 03:25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 Cynthia Graber. This will just take a minute.

 

In an earthquake, the ground beneath you gives way. It’s no longer the one thing you can count on to be solid and stable. Instead, it swerves1, dips and waves. And now scientists are saying that earthquakes can cause the ground to do something they didn’t expect—to bounce up and down like a trampoline.

Scientists at Japan’s National Institute for Earth Science and Disaster Prevention analyzed2 information from a recent quake in their country. They noticed that the ground jolted3 around in a way that couldn’t be explained with traditional models. They report their findings in the October 31st issue of the journal Science.

According to common models, earthquakes are expected to ripple4 horizontally—and the resulting up-down waves should be symmetrical. The June quake had rapidly accelerating up and down movement, with asymmetrical5 waves—and much higher peaks. The researchers propose a new model of how the soil is behaving. They say that lighter6 soil is bouncing off the tougher crust beneath it. Understanding how this process works is important for the architects and engineers who design bridges and buildings to withstand an earthquake’s shake.

 

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 swerves 1adf92417306db4b09902fcc027bc4f0     
n.(使)改变方向,改变目的( swerve的名词复数 )v.(使)改变方向,改变目的( swerve的第三人称单数 )
参考例句:
  • The road swerves to the right. 道路向右转弯。 来自《现代汉英综合大词典》
  • At the last moment, Nina swerves and slams into a parked car. 在最后关头,尼娜突然转弯,将车猛烈撞入一辆停着的车中。 来自互联网
2 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》
3 jolted 80f01236aafe424846e5be1e17f52ec9     
(使)摇动, (使)震惊( jolt的过去式和过去分词 )
参考例句:
  • The truck jolted and rattled over the rough ground. 卡车嘎吱嘎吱地在凹凸不平的地面上颠簸而行。
  • She was jolted out of her reverie as the door opened. 门一开就把她从幻想中惊醒。
4 ripple isLyh     
n.涟波,涟漪,波纹,粗钢梳;vt.使...起涟漪,使起波纹; vi.呈波浪状,起伏前进
参考例句:
  • The pebble made a ripple on the surface of the lake.石子在湖面上激起一个涟漪。
  • The small ripple split upon the beach.小小的涟漪卷来,碎在沙滩上。
5 asymmetrical gO7ye     
adj.不均匀的,不对称的
参考例句:
  • Most people's faces are asymmetrical.多数人的脸并不对称。
  • Folds may be gentle and symmetrical,or sharp and asymmetrical.褶皱可以是平缓而对称的,也可以是陡峭而非对称的。
6 lighter 5pPzPR     
n.打火机,点火器;驳船;v.用驳船运送;light的比较级
参考例句:
  • The portrait was touched up so as to make it lighter.这张画经过润色,色调明朗了一些。
  • The lighter works off the car battery.引燃器利用汽车蓄电池打火。
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