In the reference system of the electron at rest, the crystal field is taken as virtual photon.
在与电子纵向运动静止的坐标系中，把晶格场等效为虚光子。
When charged particle does circular motion in the accelerator, the magnetic field of the accelerator can be taken as periodic, and equivalent to virtual photon.
当带电粒子在加速器中做圆周运动时，加速器的磁场可以看作周期静磁场，可以等效为虚光子。
When charged particle does circular motion in the accelerator, the magnetic field of the accelerator can be taken as periodic, and equivalent to virtual photon.
当带电粒子在加速器中做圆周运动时，加速器的磁场可以看作周期静磁场，可以等效为虚光子。
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