Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua

Aerial photo shows the scenery of the Nuorilang Waterfall in the Jiuzhaigou National Park in southwest China's Sichuan Province, June 5, 2019. Due to damages caused by the magnitude-7.0 earthquake that hit here on Aug. 8, 2017, the park has been temporarily closed since July 2018 for renovation. Photo: Xinhua