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SSS 2008-06-23

时间:2010-05-14 02:42来源:互联网 提供网友:0922013129   字体: [ ]
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This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?

On June 4th we told you about iron snowflakes on Mercury. Today we have some radical1 news about the atmosphere of Venus. Literally2, a radical is a molecule3 that reacts easily with other chemicals because of an unpaired electron. Astronomers4 have found the hydroxyl radical in the Venusian atmosphere. Hydroxyl is oxygen with a single hydrogen H1O, if you like. The Venus Express probe discovered hydroxyl in the clouds that shroud5 the planet. Researchers from the European Space Agency announced the finding in the journal Astronomy and Astrophysics Letters. Hydroxyl is important on Earth, because it promotes the formation of ground-level ozone6, a pollutant7. Finding the radical on Venus will help scientists test their models of Venus’s atmosphere. Hydroxyl also exists in the thin Martian atmosphere where it’s thought to stabilize8 carbon dioxide and prevent it from becoming carbon monoxide. It may also be responsible for sterilizing9 the red planet’s top layers of soil.

Thanks for the minute for Scientific American’s 60-Second Science, I’m Steve Mirsky.

 


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1 radical hA8zu     
n.激进份子,原子团,根号;adj.根本的,激进的,彻底的
参考例句:
  • The patient got a radical cure in the hospital.病人在医院得到了根治。
  • She is radical in her demands.她的要求十分偏激。
2 literally 28Wzv     
adv.照字面意义,逐字地;确实
参考例句:
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
3 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
4 astronomers 569155f16962e086bd7de77deceefcbd     
n.天文学者,天文学家( astronomer的名词复数 )
参考例句:
  • Astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
  • Astronomers used to ask why only Saturn has rings. 天文学家们过去一直感到奇怪,为什么只有土星有光环。 来自《简明英汉词典》
5 shroud OEMya     
n.裹尸布,寿衣;罩,幕;vt.覆盖,隐藏
参考例句:
  • His past was enveloped in a shroud of mystery.他的过去被裹上一层神秘色彩。
  • How can I do under shroud of a dark sky?在黑暗的天空的笼罩下,我该怎么做呢?
6 ozone omQzBE     
n.臭氧,新鲜空气
参考例句:
  • The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
  • The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
7 pollutant N1Zzy     
n.污染物质,散布污染物质者
参考例句:
  • Coal itself is a heavy pollutant.煤本身就是一种严重的污染物。
  • Carbon dioxide may not be a typical air pollutant.二氧化碳可能不是一种典型的污染物。
8 stabilize PvuwZ     
vt.(使)稳定,使稳固,使稳定平衡;vi.稳定
参考例句:
  • They are eager to stabilize currencies.他们急于稳定货币。
  • His blood pressure tended to stabilize.他的血压趋向稳定。
9 sterilizing c63fac6e8072fc0113888b8681a95db0     
v.消毒( sterilize的现在分词 );使无菌;使失去生育能力;使绝育
参考例句:
  • The nurse is sterilizing the surgical instruments. 护士在把外科手术器具消毒。 来自辞典例句
  • By testing, steam is the ble sterilizing method for herbal medicine. 这些方法难以保证药性,或有残留,要不然就是费用昂贵。 来自互联网
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