原子内的一个中子衰变后会产生一个质子、一个电子和一个中微子。
When a neutron inside an atom decays, it produces a proton, an electron, and a neutrino.
这些物质被称作“放射性同位素”—同一种元素的变种，他们具有异常的中子数量，频繁的衰变和放出辐射。
These materials are known as "radioisotopes" -versions of an element that, because they have an abnormal number of neutrons, frequently decay and release radiation.
反中子逃离大气，然后在高得多的区域衰变为反质子。
The antineutrons escape the atmosphere and then decay into antiprotons at much higher altitudes.
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