Photo taken on Nov. 29, 2020 shows a Christmas tree with light chains in front of the Brandenburg Gate in Berlin, capital of Germany. This year's Christmas tree set up in front of Berlin's Brandenburg Gate is a 15m high white fir from German state Thuringia. (Photo: Xinhua)

Photo taken on Nov. 29, 2020 shows a Christmas tree with light chains in front of the Brandenburg Gate in Berlin, capital of Germany. This year's Christmas tree set up in front of Berlin's Brandenburg Gate is a 15m high white fir from German state Thuringia. (Photo: Xinhua)

Photo taken on Nov. 29, 2020 shows a Christmas tree with light chains in front of the Brandenburg Gate in Berlin, capital of Germany. This year's Christmas tree set up in front of Berlin's Brandenburg Gate is a 15m high white fir from German state Thuringia. (Photo: Xinhua)