费密子一种如电子、质子或中子等自旋为半整数的基本粒子，具有一种使得不可能有多于一个的粒子占有任何一个特殊的量子力学态的量子力学对称性 A particle, such as an electron, a proton, or a neutron, having half-integral spin and obeying statistical rules requiring that not more than one in a set of identical particles may occupy a particular quantum state.
衰变的具有相对较短的寿命而衰变，常用于亚原子粒子 Decaying with relatively short lifetime. Used of subatomic particles.
辐射尘以这种方式落下的放射性粒子 The particles that descend in this fashion.
原子里的粒子极小。 The particles in an atom are infinitely small.