英语听力文摘 English Digest 463、最大的磁体

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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.

 

1 standing   

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   

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   

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。