名词
中文翻译：同位素
同义词：
['isotope', 'isotope例句：1. The isochrones of the stars are used to calculate their distances from Earth.（恒星的同位素可以用来计算它们离地球的距离。）']
例句：
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1. The isochrones of the stars are used to calculate their distances from Earth.
恒星的同位素可以用来计算它们离地球的距离。
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2. The study of isochrones is important for understanding the evolution of life on Earth.
研究同位素对于理解地球上生命演化过程非常重要。
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3.The isochrones of the planets are used to determine their masses and orbits.
行星的同位素用于确定它们的质量和轨道。