Reflection of a watermill on the surface of the water in the eveningReflection of a watermill on the surface of the water in the evening
A satellite above the surface of a celestial body. view from spaceA satellite above the surface of a celestial body. View from space
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..