Cb a picture of the sea surface against the background of the cityCB a picture of the sea surface against the background of the city
Stone surface against the background of the night skyStone surface against the background of the night sky
A lonely boat on the blue surface of the sea under white cloudsA lonely boat on the blue surface of the sea under white clouds
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..