Christmas tree in the center of the screen backgroundChristmas tree in the center of the screen background
A scientist on the background of a blackboard with formulasA scientist on the background of a blackboard with formulas
Yellow lightning in a yellow circle on a red background emblemYellow lightning in a yellow circle on a red background emblem
Показатель, примета, знак, по к-рым можно узнать, определить что-н..