Trees in autumn attire, reflected in the surface of the lake in clear and windless weatherTrees in autumn attire, reflected in the surface of the lake in clear and windless weather
The fiery sunset is reflected in the water surface of the lakeThe fiery sunset is reflected in the water surface of the lake
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..