Lightning cutting the surface of the sky reaches directly to the groundLightning cutting the surface of the sky reaches directly to the ground
An inhomogeneous surface with a visible image of a tigerAn inhomogeneous surface with a visible image of a tiger
A red helicopter flies over the surface of the oceanA red helicopter flies over the surface of the ocean
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..