以下为句子列表：
英文: Most of Earth's internal heat is generated by four long-lived radioisotopes—potassium 40, thorium 232, uranium 235 and uranium 238—that release energy over billions of years as they decay into stable isotopes.
中文: 地球内部的热能主要来自半衰期较长的四种放射性同位素──钾40、钍232、铀235与铀238，它们在几十亿年来逐渐衰变成稳定的同位素，同时释放能量。
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英文: Since the unstable nuclei exist between actinides, including thorium and stable nuclei like lead and bismuth, explosive events such as supernovae are required to produce actinides.
中文: 自不稳定核之间存在着锕系元素,包括钍和稳定核像灌了铅,铋,爆炸性事件,如超需出示锕.
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英文: Surprisingly for astronomers and nuclear physicists, the abundance ratios of thorium to other heavy elements are very similar to ratios found for Milky Way stars.
中文: 出乎意料的天文学家和核物理学家丰比率钍等重元素非常相似比率发现银河系恒星.
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英文: The decrease of the flux shown by the arrow indicates the absorption of light by thorium ions at the surface of the star; i.e., the stronger feature means a higher abundance of thorium.
中文: 下降的通量显示箭头表明对光的吸收钍离子表面该星;即较强的特点,手段更高丰富的钍.
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英文: The team's measurement of thorium revealed the overall abundance pattern of heavy elements for this object.
中文: 该队的测量发现钍的总体格局丰富的重元素,为这个目的.
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