Isotope analysis of her hair revealed that she spent the years before she died in America's western mountains, which helps detectives concentrate their search.

分析其头发中的同位素，显示了她在被害前曾在美国西部的山区生活过几年，这有助于警探集中调查。

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Combined with oxygen isotope testing, the analysis suggested that at least one headless millet-eater came from Eastern Europe or somewhere with access to water from high altitudes.

再加上检测同位素氧，分析表明至少有一具吃过小米的无头尸的主人，来自东欧，或者来自高海拔地区。

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Isotope dilution analysis is a valid approach for studying nitrogen transformation characteristics in soil-plant systems.

同位素稀释分析是研究氮素在土壤植物体系中转化和迁移特征的有效方法。

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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.

ECONOMIST: A cave in South Africa may rewrite human history

Combined with finds of exotic objects in and around the circles, the evidence from isotope analysis of the bones of animals eaten at these sites points to the fact that people were travelling to get to them.

BBC: Discovering Britain��s prehistoric stone circles

Another analysis, also published in the journal Science, looks at the amount of the isotope beryllium-10 in the lunar soil.

BBC: Apollo samples reveal Moon's origin