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SSS 2008-06-04

时间:2010-05-14 01:51来源:互联网 提供网友:0922013129   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science, I am Cynthia Graber.This'll just take a minute.

On earth, snow crystals as we all know, form from frozen water. But scientists believe there're also flakes1 that fall on Mercury, and they're made of iron. They published their findings in the journal Geophysical Research Letters.Investigators2 have been trying to figure out why Mercury is the only other terrestrial planet in our solar system that has a global magnetic field. It's about 100 times weaker than Earth's. No previous models have been able to predict what would cause this type of situation. So researchers at the University of Illinois and Case Western University set up an experiment to try to figure it out. They created a molten iron and sulfur3 mixture similar to Mercury's core . They subjected the mix to high temperatures and pressures. And they analyzed4 what happened in this Mercury model. Turns out that as the outer core cools, the iron forms what researchers call "cubic flakes "that slowly fall to a core's center. As the iron snow falls, the sulfur-rich liquid rises, researchers believe these currents produce the weak magnetic fields and Mercury's iron snow.

Thanks for the minute for Scientific American's 60-Second Science ,I am Cynthia Graber.


点击收听单词发音收听单词发音  

1 flakes d80cf306deb4a89b84c9efdce8809c78     
小薄片( flake的名词复数 ); (尤指)碎片; 雪花; 古怪的人
参考例句:
  • It's snowing in great flakes. 天下着鹅毛大雪。
  • It is snowing in great flakes. 正值大雪纷飞。
2 investigators e970f9140785518a87fc81641b7c89f7     
n.调查者,审查者( investigator的名词复数 )
参考例句:
  • This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
3 sulfur ps4wC     
n.硫,硫磺(=sulphur)
参考例句:
  • Sulfur emissions from steel mills become acid rain.炼钢厂排放出的硫形成了酸雨。
  • Burning may produce sulfur oxides.燃烧可能会产生硫氧化物。
4 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》
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