The oxygen isotoperatio of the ocean changes as a great deal of water is withdrawn from it by evaporation and is precipitated as snow to form glacial ice.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。
2
The isotoperatio 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。
3
But the team found that on the Moon it was about 25 times that of the terrestrial chlorine isotoperatio.