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1. The isotopes are used in the analysis of environmental pollution.
同位素用于环境污染的分析。
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2. The scientists found that the isotopes were different from those in the sample.
科学家们发现同位素与样本中的不同。
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3. The study on isotopes is crucial for understanding the origin of life.
同位素研究对于理解生命的起源至关重要。