放射性元素在自然衰败过程中所产生的热量能使星球上的水维持液态形式。
Heat from the decay of naturally occurring radioactive elements could keep a planet warm enough for water.
如同伽利略号，卡西尼号的能源来自放射性元素钸的自然衰变，产生热后再转换成电。
Like Galileo, Cassini is powered by the natural decay of the radioactive element plutonium, which generates heat that is then converted to electricity.
在自然界，凡原子核不稳定，过一些时间自发地变成其它元素原子核的元素，称为放射性元素。
In nature, the element, whose nucleus is unstable and will grows to be nuclear of other element, is called radioactive element.
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