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1.The isotopes of carbon have been studied for their potential applications in medicine.
碳的同位素已被研究，以探索其在医学上的潜在应用。
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2.The isotope ratios of the carbon-14 and carbon-12 isotopes are used to determine the age of the Earth.
碳-14和碳-12同位素的比值被用来测定地球的年龄。
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3. The study of isotopes has led to a better understanding of the origins of life on Earth.
同位素的研究有助于我们更好地理解地球上生命的起源。