作为地球气候变化的指标，同位素记录有两个优势。
As an indicator of shifts in the Earth's climate, the isotope record has two advantages.
对贝壳的同位素分析使得地质学家可以测量另一种冰川效应。
Isotopic analysis of shells allowed geologists to measure another glacial effect.
这种反常现象是由于同位素比较丰富或者各个元素比较多样化。
Such anomalies are due to the relative abundance of the "isotopes" or varieties of each element.
因此，更多的重氧同位素留在了海洋里，并被海洋有机物吸收。
Thus, more of the heavy isotope is left behind in the ocean and absorbed by marine organisms.
一个特定元素的同位素具有相同的化学特征，但在物理性质上有一些细微差异。
The isotopes of a given element have the same chemical properties but slightly different physical properties.
水中几乎所有的氧都是氧16，但每一千个分子中就有几个含有较重的同位素18。
Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18.
通过测量一束头发上较重的氢和氧同位素的比例，科学家可以构建一个地理时间轴。
By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline.
这是一个全球性的记录：在取自不同大陆位置的沉积标本中，同位素比率的变化非常小。
It is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations.
她经常把装有放射性同位素的试管放在口袋里，对试管里发出的漂亮的蓝绿光赞不绝口。
She had often carried test tubes containing radioactive isotopes in her pocket, remarking on the pretty blue-green light they gave off.
在水中大多数氢原子和氧原子是稳定的，但这两个元素也有微量以较重的同位素形式存在。
Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes.
给定元素的所有同位素都含有相同的质子数，但它们的中子数不同，因此它们的原子质量也不同。
All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.
同位素年代记录显示，过去几十万年全球冰量的波动有一个模式：冰河期大约每10万年发生一次。
The dated isotope record shows that the fluctuations in global ice volume over the past several hundred thousand years have a pattern: an ice age occurs roughly once every 100,000 years.
随着大量的水通过蒸发被抽离，并以雪的形式沉淀形成冰川冰，海洋中氧同位素的比率就发生了变化。
The oxygen isotope ratio of the ocean changes as a great deal of water is withdrawn from it by evaporation and is precipitated as snow to form glacial ice.
当空气温度较高时，含有较重同位素氧-18的蒸汽比含有氧-16的蒸汽更容易凝结，并形成雪状的降水。
When the air was warm, vapor containing the heavier isotope, oxygen-18, condensed and formed precipitation, in the form of snow, more readily than did vapor containing oxygen-16.
研究人员对间冰期气候的线索来自保存在GRIP 冰芯中的两种略微不同类型的氧——即同位素氧-16和氧-18的比率。
Researchers' clues to the Eemian climate come from measurements of the ratios of two slightly different types of oxygen, isotopes oxygen-16 and oxygen-18, preserved in the GRIP core.
当水从海洋表面蒸发时，往往会留下较重的同位素，所以剩余的海水会逐渐富含氧18这种同位素。
Heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.
然而，大约在同一时间，科学家们意识到彗星可能含有衰变的放射性同位素，这些同位素可能使彗星内部的温度升高到导致内部进化的温度。
About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve.
将体外翻译产物的免疫沉淀物经SDS-聚丙烯酰胺电泳，得到相当于人血清白蛋白的同位素标记的电泳区带。
When the immunoprecipitate was subjected to SDS agarose gel electrophoresis, 3 radioactive bands were obtained, one of which corresponded to pure human albumin in its position.
铼的同位素被运用于肝癌的治疗。
这一次是碳同位素泄露了秘密。
这项技术基于对同位素的研究。
元素后面的数字表明特定同位素的身份。
The number after the element name identifies the specific isotope.
这将形成地理上同位素构成类似的区域。
This creates regions with geographically similar isotope values.
但是同位素的用处更多。
放射性同位素在现代医学中占有重要位置。
同位素是一个特定化学元素的不同原子变种。
Isotopes are different atomic versions of a particular chemical element.
这也是易裂变同位素。
研究人员使用这种同位素追踪人体中的轨迹。
The isotope-labeled chemical is used for the researchers to track its fate in the human body.
听同位素讲述行星起源的故事。
钋的同位素在自然界中的确存在，但是相当罕见。
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