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1·As an indicator of shifts in the Earth's climate, the isotope record has two advantages.

作为地球气候变化的指标，同位素记录有两个优势。

2·Thus, more of the heavy isotope is left behind in the ocean and absorbed by marine organisms.

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。

3·Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18.

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。

4·It is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations.

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。

5·The oxygen isotope ratio of the ocean changes as a great deal of water is withdrawn from it by evaporation and is precipitated as snow to form glacial ice.

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。

6·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.

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。

7·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.

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。

8·And this again is the fissile isotope.

这也是易裂变同位素。

9·The isotope does occur in nature but only extremely rarely.

钋的同位素在自然界中的确存在，但是相当罕见。

10·This creates regions with geographically similar isotope values.

这将形成地理上同位素构成类似的区域。

(1)stable isotope稳定同位素

(1)radioactive isotope放射性同位素

(1)isotope analysis同位素分析

(1)isotope separation同位素分离

(1)isotope geochemistry同位素地球化学

(1)isotope effect同位素效应