核衰變產生的微粒或電磁波放射物的原子或分子由于核衰變放出的一束微?；螂姶挪?br/>A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
眾所周知，世界是由叫做原子的小微粒組成的。 As is known to all, the world is made up of small particles called atoms.
物質是由叫做分子的微粒組成的。 Substances consist of small particles called molecules.
