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英语听力文摘 English Digest 463、最大的磁体

时间:2012-02-02 07:25来源:互联网 提供网友:Jessicalv   字体: [ ]
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The Biggest Magnet  最大的磁体

A: What’s the biggest magnet ever?

B: Well, that's a great question. Well, for starters you’d have to mention whoppers like the hybrid magnet at the National High Magnetic Field Lab in Tallahassee, Florida. This magnet weighs thirty-four tons and stands twenty-two feet tall.

Giant magnets in hospitals, physics labs, and other facilities help in cutting edge research. However, even a magnet the size of a building can’t compete with a magnet the size of a planet.

A: A magnet the size of a planet?

B: The Earth itself is a magnet! Researchers think it’s the effect of convection currents in our planet’s molten interior that causes the entire Earth to behave as one gigantic magnet, with a North and South Pole.

Whenever you look at a compass, what you’re doing is reading the magnetic field of the planet on which you are standing1.

A: So that must be the biggest magnet than anywhere.

B: Yet, even a magnet the size of a planet can’t compete with a magnet the size of a star.

A: A star?

B: what about the sun? The sun is a magnet. In this case, the magnetic field is probably generated by swirling2 plasma3. Magnetic storms on the sun are powerful enough to have an effect on satellites and communication systems all the way here on Earth.

A: So is that?

B: Not even close. There are things in space that put all of these magnets to shame.

A: Super magnet in space? What are they?

B: Next time.


 


点击收听单词发音收听单词发音  

1 standing 2hCzgo     
n.持续,地位;adj.永久的,不动的,直立的,不流动的
参考例句:
  • After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
  • They're standing out against any change in the law.他们坚决反对对法律做任何修改。
2 swirling Ngazzr     
v.旋转,打旋( swirl的现在分词 )
参考例句:
  • Snowflakes were swirling in the air. 天空飘洒着雪花。 来自《现代汉英综合大词典》
  • She smiled, swirling the wine in her glass. 她微笑着,旋动着杯子里的葡萄酒。 来自辞典例句
3 plasma z2xzC     
n.血浆,细胞质,乳清
参考例句:
  • Keep some blood plasma back for the serious cases.留一些血浆给重病号。
  • The plasma is the liquid portion of blood that is free of cells .血浆是血液的液体部分,不包含各种细胞。
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