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。

By Compton scattering of virtual photon with relativistic electron, the virtual photon can be transformed into real photon to radiate out.

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一个实的或虚的光子可以自发地湮没。

A real or virtual photon may spontaneously annihilate.

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于是这对光子就会由虚转实，形成一股可观察到的向外光通量，而此时黑洞的质量也会相应下降。

The pair can then pass from virtual to real, leading to an outward flux of observable light and a corresponding decrease in the mass of the hole.

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