砂金中的微量铅同位素分析具有特殊的意义。
The isotope analysis of minim lead in the gold dust has special meaning.
第三种重要方法是同位素示踪分析。
一项对这些颗粒的同位素分析让这种担心成真了。
An isotopic analysis of the grains has made that fear come true.
一项对这些颗粒的同位素分析让这种担心成真了。
An isotopic analysis of the grains has made that fear come true.
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