Black-headed gulls rest on a lake at Haibao park in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Nov. 29, 2019. The city embraced the first snowfall of this winter on Friday. Photo:Xinhua

Photo taken on Nov. 29, 2019 shows the snow scenery at Haibao park in Yinchuan, northwest China's Ningxia Hui Autonomous Region. The city embraced the first snowfall of this winter on Friday. Photo:Xinhua

Photo taken on Nov. 29, 2019 shows the snow scenery at Haibao park in Yinchuan, northwest China's Ningxia Hui Autonomous Region. The city embraced the first snowfall of this winter on Friday. Photo:Xinhua

A black-headed gull rests near a lake at Haibao park in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Nov. 29, 2019. The city embraced the first snowfall of this winter on Friday. Photo:Xinhua

Black-headed gulls fly over a lake at Haibao park in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Nov. 29, 2019. The city embraced the first snowfall of this winter on Friday. Photo:Xinhua

Black-headed gulls fly over a lake at Haibao park in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Nov. 29, 2019. The city embraced the first snowfall of this winter on Friday. Photo:Xinhua