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1.The isotopes in the sample were analyzed to determine its composition.
对样本中的同位素进行了分析，以确定其组成。
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2. The isotopes of carbon and nitrogen are essential for plant growth.
碳和氮的同位素对于植物生长至关重要。
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3.The isotopes of hydrogen and oxygen are used in various applications, such as medicine and agriculture.
氢和氧的同位素在各种应用中被使用，如医学和农业。