Aerial photo taken on July 2, 2020 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province. (Photo/China News Service)

Aerial photo taken on July 2, 2020 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province. (Photo/China News Service)

Aerial photo taken on July 2, 2020 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province. (Photo/China News Service)

Aerial photo taken on July 2, 2020 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province. (Photo/China News Service)

People take photos at the Hukou Waterfall scenic spot in Linfen, north China's Shanxi Province, July 2, 2020. (Photo/China News Service)