isotope

英 ['a?s?t??p] 美['a?s?'top]

TEM8GRE低頻詞擴展詞匯

復數(shù):?isotopes;

isotope 同位素

iso-,等，同，-top,位置，地方，詞源同topic,utopia.即等位置的，引申詞義同位素。

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.: 激光可以改變這種局面,從而使同位素分離變得比較容易、比較廉價一些.

2. This indium isotope was created at the same time as the earth.: 這種銦同位素與地球產生在同一時代.

3. The isotope ratio is directly used for comparing oils or gases.: 同位素比率直接用于比較各種石油或天然氣.

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

5. There are several ways to separate excited from unexcited molecules, thus harvesting the desired isotope.: 目前有幾種方法可以把受激發(fā)分子同未受激發(fā)分子分離開, 這樣,就可以大量得到我們所需要的同位素了.