... 铀钍铅年龄测定：U-Th-Pb dating 铀同位素年龄：uranium isotope age 铀碳钙石：kalk-uran-carbonate ...
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In this case the geologists drilled into the stalagmites and estimated their age from the way that uranium decays into an isotope of thorium.
地质学家在石笋上钻孔，使用铀衰变成钍的同位素的方法确定它们的年龄。
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