The oxygen isotope ratio of the ocean changes as a great deal of water is withdrawn from it by evaporation and is precipitated as snow to form glacial ice.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

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Oxygen isotope records of stalagmites from Southern China provide very important climatic information.

中国南部石笋氧同位素记录记载了重要的气候变化信息。

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The composition of oxygen isotope is a good tool to trace the origin and formation environment of sulfate.

氧同位素组成是一个非常有效的示踪硫酸盐的起源和形成环境的工具。

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"Previous workers have applied the same oxygen isotope technique and reported relatively cool temperatures, " Dr Pearson said.

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Tests on the sand they were buried in, using two different dating techniques (thermoluminescence and oxygen-isotope analysis), suggest they are between 70, 000 and 80, 000 years old.

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