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美国科学60秒 SSS 2013-01-15

时间:2013-07-22 08:37:58

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(单词翻译)

   How do you to find 1 kilogram? Easy. It's the exact mass of medal cylinder1 called the international prototype kilogram. IPK, for short. Kept in controlled conditions in France. But the standard kilogram has gained weight since its creation in 1875. To trim and end its many replicas3 down to size, we need to clean them. The report is in the journal M*. When scientists analyzed4 the surface of an IPK replica2, they found it carries tens of additional macro-grams. These changes are due to contaminates built up in the kilograms despite their careful storage of the glass. The additional mass as equal to just a grain of sand, but the kilogram is such an essential unit that tiny changes  to different replicas are important. To remove the contaminates, we need to standard and reproducible cleaning method. Researchers exposed one kilogram measure to ozone5 and ultraviolet light which would remove the cover base contamination without damage the medal. But to permanently6 standardize7 the kilogram we will need to find terms of fundamental coincidence, not a lump of medal in a jar.


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1 cylinder rngza     
n.圆筒,柱(面),汽缸
参考例句:
  • What's the volume of this cylinder?这个圆筒的体积有多少?
  • The cylinder is getting too much gas and not enough air.汽缸里汽油太多而空气不足。
2 replica 9VoxN     
n.复制品
参考例句:
  • The original conservatory has been rebuilt in replica.温室已按原样重建。
  • The young artist made a replica of the famous painting.这位年轻的画家临摹了这幅著名的作品。
3 replicas 3b4024e8d65041c460d20d6a2065f3bd     
n.复制品( replica的名词复数 )
参考例句:
  • His hobby is building replicas of cars. 他的爱好是制作汽车的复制品。 来自《简明英汉词典》
  • The replicas are made by using a thin film of fusible alloy on a stiffening platen. 复制是用附着在加强托板上的可熔合金薄膜实现的。 来自辞典例句
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》
5 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。
6 permanently KluzuU     
adv.永恒地,永久地,固定不变地
参考例句:
  • The accident left him permanently scarred.那次事故给他留下了永久的伤疤。
  • The ship is now permanently moored on the Thames in London.该船现在永久地停泊在伦敦泰晤士河边。
7 standardize UuMwl     
v.使符合标准,使标准化
参考例句:
  • We will extend and standardize legal services and provide effective legal aid.拓展和规范法律服务,积极开展法律援助。
  • There is a drive both to standardise components and to reduce the number of models on offer.正在为实现零部件标准化和减少推出的型号数量而努力。

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