Photo taken on May 19, 2019 shows azalea flowers in Dahinggan Mountains in Ergun, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)

　　Photo taken on May 20, 2019 shows azalea flowers in Dahinggan Mountains in Ergun, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)

　　Photo taken on May 20, 2019 shows azalea flowers in Dahinggan Mountains in Ergun, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)