Winter view of Hongjiannao Lake in NW China's Shaanxi

Aerial photo taken on Nov. 28, 2019 shows swans flying over the Hongjiannao Lake in Shenmu City, northwest China's Shaanxi Province. Hongjiannao Lake, located in Shenmu City, is a well-known desert freshwater lake in China. (Xinhua/Shao Rui)