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 Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through Earth's orbit around the sun.
地球的自转轴与黄道面呈一定角度。黄道面是地球公转轨道所在的一个假想平面。
The Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through Earth's orbit around the sun.
地球的自转轴与黄道面呈一定角度。黄道面是地球公转轨道所在的一个假想平面。
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