A real or virtual photon may spontaneously annihilate.
一个实的或虚的光子可以自发地湮没。
In NRWA, the main factor which will deslroy the non classical effects is the virtual photon term.
不作旋转波近似， 破缺可积性的因素，主要来自虚光场项。
By Compton scattering of virtual photon with relativistic electron, the virtual photon can be transformed into real photon to radiate out.
当虚光子与作沟道运动的电子发生康普顿散射时，虚光子就会转化为实光子辐射出去。
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