Johnson's team analyzed trace elements and carbon and oxygen isotopes in the hardened cave drippings.

约翰逊的团队分析了硬化洞穴水滴中的微量元素和碳氧同位素。

Oxygen isotopes can tell us how oceans changed, mineral dust tells us about how the atmosphere moved around, there are chemical clues about early volcanoes.

氧的同位素可以告诉我们海洋是如何变化的，矿物灰尘告诉我们大气是如何移动的，还有早期火山的化学线索。

But all the other rocks we knew from elsewhere in the solar system which are meteorites that fall out of space, all have different oxygen isotope ratios.

但是我们掌握的来自太阳系其它地方的所有石块，那些从太空落下的陨石，都具有不同的氧同位素的比率。

The researchers could tell that seeds had been deposited higher up the mountain than they had been harvested by the ratio of their oxygen isotopes, which changes with altitude.

通过研究氧同位素的比例，研究人员发现随着海拔的变化，种子所在地区的海拔会升高。

In fact, in combination with an oxygen isotope, it's used in lots of nutrition experiments in humans because it's a useful way to track how much energy you're spending.

事实上，与氧同位素的结合会用于许多人体的营养实验中，因为它可以有效追踪你使用了多少能量。

In fact, in combination with an oxygen isotope, it’s used in lots of nutrition experiments in humans because it’s a useful way to track how much energy you’re spending.

事实上，结合氧同位素， 它被用于许多人体营养实验，因为它是跟踪您消耗了多少能量的有用方法。