isotope

英 ['aɪsətəʊp] 美['aɪsə'top]

TEM8GRE低频词扩展词汇

复数: isotopes;

isotope 同位素

iso-,等，同，-top,位置，地方，词源同topic,utopia.即等位置的，引申词义同位素。

isotope: isotope: [20] The term isotope for a version of an element with a particular atomic weight was coined in 1913 by the British chemist Frederick Soddy. It means literally ‘equal place’ and was formed from two Greek components, the prefix iso- ‘equal’ and the noun tópos ‘place’ (source of English topic). The reason for the coinage was that although isotopes of the same element have different atomic weights, they occupy the ‘same place’ in the periodic table of elements.
=> topic
isotope (n.): 1913, literally "having the same place," introduced by British chemist Frederick Soddy (1877-1956) on suggestion of Margaret Todd, from Greek isos "equal" (see iso-) + topos "place" (see topos); so called because despite the different atomic weights, the various forms of an element occupy the same place on the periodic table.

1. Lasers promise to change this by making isotope separation easier, and cheaper.: 激光可以改变这种局面,从而使同位素分离变得比较容易、比较廉价一些.

2. This indium isotope was created at the same time as the earth.: 这种铟同位素与地球产生在同一时代.

3. The isotope ratio is directly used for comparing oils or gases.: 同位素比率直接用于比较各种石油或天然气.

4. Changes of nuclear mass and nuclear size cause isotope shifts.: 原子核质量和大小的不同引起同位素移动.

5. There are several ways to separate excited from unexcited molecules, thus harvesting the desired isotope.: 目前有几种方法可以把受激发分子同未受激发分子分离开, 这样,就可以大量得到我们所需要的同位素了.