The "surface" of a black hole is the so-called event horizon, an imaginary surface surrounding the mass of the black hole.
黑洞“表面”就是所谓的活动视界，一个想像的黑洞质量周围的。
The "surface" of a black hole is the so-called event horizon, an imaginary surface surrounding the mass of the black hole.
黑洞“表面”就是所谓的活动视界，一个想像的黑洞质量周围的。
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