Photo taken on Nov. 20, 2019 shows snow-covered trees in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region. (Photos: Xinhua)

Aerial photo taken on Nov. 21, 2019 shows the view of a road in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 20, 2019 shows the view of the forest in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region.

Photo taken on Nov. 20, 2019 shows snow-covered trees in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 20, 2019 shows the view of the forest in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 21, 2019 shows the view of a road in Arxan in Hinggan League, north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 21, 2019 shows the view of a highway in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region.

Photo taken on Nov. 20, 2019 shows snow-covered forest in Arxan of Hinggan League, north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 21, 2019 shows the urban scenery of Arxan in north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 21, 2019 shows the urban scenery of Arxan in north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 20, 2019 shows the night urban scenery of Arxan in north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 20, 2019 shows the night urban scenery of Arxan in north China's Inner Mongolia Autonomous Region.

Aerial photo taken on Nov. 20, 2019 shows the night urban scenery of Arxan in north China's Inner Mongolia Autonomous Region.