A man takes photos of a snowman holding a piece of paper reading "Stay healthy" at a park in Frankfurt, Germany, Jan. 17, 2021. (Xinhua/Lu Yang)

A snowman holding a piece of paper reading "Stay healthy" is seen at a park in Frankfurt, Germany, Jan. 17, 2021. (Xinhua/Lu Yang)

People look at a snowman holding a piece of paper reading "Stay healthy" at a park in Frankfurt, Germany, Jan. 17, 2021. (Xinhua/Lu Yang)

Children look at a snowman holding a piece of paper reading "Stay healthy" at a park in Frankfurt, Germany, Jan. 17, 2021. (Xinhua/Lu Yang)