By measuring the proportion of heavier hydrogen and oxygenisotopes along a strand of hair, scientists can construct a geographic timeline.
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。
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Researchers' clues to the Eemian climate come from measurements of the ratios of two slightly different types of oxygen, isotopesoxygen-16 and oxygen-18, preserved in the GRIP core.