Aerial photo taken on May 23, 2019 shows a countryside scenery by the Lianxi River in Daoxian County of Yongzhou, central China's Hunan Province. (Photo: Xinhua)

Aerial photo taken on May 23, 2019 shows a countryside scenery by the Lianxi River in Daoxian County of Yongzhou, central China's Hunan Province. (Photo: Xinhua)

Aerial photo taken on May 23, 2019 shows a countryside scenery by the Lianxi River in Daoxian County of Yongzhou, central China's Hunan Province. (Photo: Xinhua)

Aerial photo taken on May 23, 2019 shows a countryside scenery by the Lianxi River in Daoxian County of Yongzhou, central China's Hunan Province. (Photo: Xinhua)

Aerial photo taken on May 23, 2019 shows a countryside scenery by the Lianxi River in Daoxian County of Yongzhou, central China's Hunan Province. (Photo: Xinhua)