Aerial photo taken on April 13, 2020 shows a view of the Luonan County at dawn in northwest China's Shaanxi Province. The county is located in the Qinling Mountains, which is a natural boundary between China's north and south. (Xinhua/Tao Ming)

Aerial photo taken on April 13, 2020 shows a view of the Luonan County at dawn in northwest China's Shaanxi Province. The county is located in the Qinling Mountains, which is a natural boundary between China's north and south. (Xinhua/Tao Ming)

Aerial photo taken on April 13, 2020 shows a view of the Luonan County at dawn in northwest China's Shaanxi Province. The county is located in the Qinling Mountains, which is a natural boundary between China's north and south. (Xinhua/Tao Ming)

Aerial photo taken on April 13, 2020 shows a view of the Luonan County at dawn in northwest China's Shaanxi Province. The county is located in the Qinling Mountains, which is a natural boundary between China's north and south. (Xinhua/Tao Ming)

Aerial photo taken on April 13, 2020 shows a view of the Luonan County at dawn in northwest China's Shaanxi Province. The county is located in the Qinling Mountains, which is a natural boundary between China's north and south. (Xinhua/Tao Ming)