Aerial photo taken on Nov. 21, 2020 shows a snow-covered cityscape in Xining, capital city of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Nov. 21, 2020 shows a snow-covered cityscape in Xining, capital city of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Nov. 21, 2020 shows a snow-covered cityscape in Xining, capital city of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Nov. 21, 2020 shows a snow-covered cityscape in Xining, capital city of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Nov. 21, 2020 shows a snow-covered cityscape in Xining, capital city of northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Nov. 21, 2020 shows a snow-covered cityscape in Xining, capital city of northwest China's Qinghai Province. (Xinhua/Wu Gang)