自发发射的机制是一有争论的问题。
The physical mechanisms responsible for spontaneous emission has been a controversial issue.
自发发射是光学和辐射学中最基本的问题，也是量子光学的基础之一。
Spontaneous emission is a basic phenomenon in the study of light and radiology.
自发发射是光学和辐射学中最基本的问题，也是量子光学的基础之一。
Spontaneous emission is a basic phenomenon in the study of light and radiology.
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