原子激发态是不稳定的，其必然会自发地向低能级衰变，产生自发辐射现象。
Atom's motivated state in not stable, it inevitably disintegrate into the lower energy state, which makes the phenomenon of the spontaneous radiation.
原子激发态是不稳定的，其必然会自发地向低能级衰变，产生自发辐射现象。
Atom's motivated state in not stable, it inevitably disintegrate into the lower energy state, which makes the phenomenon of the spontaneous radiation.
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