An expert explains on methods of flower arrangement to visitors at the Beijing Garden at the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, May 1, 2019. The expo kicked off its "Beijing Day" event themed "Beautiful Beijing Shinning at the Expo" on Wednesday and will last until Friday. A series of activities will be held to demonstrate achievements the capital has made in ecological, cultural and urban development and international exchange. (Xinhua/Ju Huanzong)