natural decay

• 自然衰变

natural decay的用法和样例：

例句

1. Like Galileo, Cassini is powered by the natural decay of the radioactive element plutonium, which generates heat that is then converted to electricity.
   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。