同位素比值质谱法
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Stable Isotope Ratio Mass Spectrometry 稳定同位素比值质谱仪
Gas Isotope Ratio Mass Spectrometry 气体同位素质谱仪
gas chromatography-isotope ratio mass spectrometry 气相色谱
The most likely alternatives, butter and pig fat, were ruled out using a technique called isotope-ratio mass spectrometry, which measures the molecular weights of the chemicals in a sample.
ECONOMIST: The Romans, too, had sophisticated cosmetics
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