Aerial photo taken on May 30, 2019 shows the scenery of Wulongdong National Forest Park in Lueyang county, Northwest China’s Shaanxi province.[Photo/Xinhua]

Photo taken on May 30, 2019 shows the scenery of Wulongdong National Forest Park in Lueyang county, Northwest China’s Shaanxi province.[Photo/Xinhua]

Photo taken on May 30, 2019 shows the scenery of Wulongdong National Forest Park in Lueyang county, Northwest China’s Shaanxi province.[Photo/Xinhua]

Aerial photo taken on May 30, 2019 shows the scenery of Wulongdong National Forest Park in Lueyang county, Northwest China’s Shaanxi province.[Photo/Xinhua]

People enjoy the scenery of Wulongdong National Forest Park in Lueyang county, Northwest China’s Shaanxi province, May 30, 2019.[Photo/Xinhua]

Photo taken on May 30, 2019 shows the scenery of Wulongdong National Forest Park in Lueyang county, Northwest China’s Shaanxi province.[Photo/Xinhua]