A red helicopter flies over the surface of the oceanA red helicopter flies over the surface of the ocean
A mirror image of the forest in the surface of the lakeA mirror image of the forest in the surface of the lake
Macro photography of the surface of dry land on which the first raindrops fellMacro photography of the surface of dry land on which the first raindrops fell
Three brand-new smartphones lying on a glass surfaceThree brand-new smartphones lying on a glass surface
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..