名词
中文翻译：同位素标记
同义词：
['isotope labeling', 'isotopic labeling']
例句：
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1.The scientists used isotopes to trace the origin of the water in the river.
科学家们使用同位素来追踪河流中水的源头。
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2. The isotopes were used to study the behavior of the molecules in the sample.
这些同位素被用来研究样本中分子的行为。
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3.The isotopes were used to create a map of the Earth's magnetic field.
这些同位素被用来绘制地球磁场的地图。