粒子是从天然放射性蜕变得到的带正电的氦核。
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
粒子发生衰变，本身蜕变为其它较轻的粒子，这是“正常”的事。
The "normal" thing is for a particle to undergo decay and transmute itself into other lighter particles.
铝可以通过俘获。粒子、排出质子而被蜕变成一种稳定的硅原子。
Aluminium can be transformed, by the capture of an alpha particle and the emission of a proton, into a stable silicon atom.
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