Two pedestrians walk in snow in Berlin, capital of Germany, Feb. 9, 2021. (Photos: Xinhua)

Photo taken on Feb. 9, 2021 shows branches covered with snow in Berlin, capital of Germany.

Two children play in snow in Berlin, capital of Germany, Feb. 9, 2021.

Three birds swim by flowing ice in the Spree River in Berlin, capital of Germany, Feb. 9, 2021.

The Bundestag building is reflected by the Spree River with flowing ice in Berlin, capital of Germany, Feb. 9, 2021.

A pedestrian holding an umbrella stands in snow in Berlin, capital of Germany, Feb. 9, 2021.

Photo taken on Feb. 9, 2021 shows the Spree River with flowing ice in Berlin, capital of Germany.

Photo taken on Feb. 9, 2021 shows Berlin Victory Column in Berlin, capital of Germany.

Birds stand on the frozen Spree River in Berlin, capital of Germany, Feb. 9, 2021.