Aerial photo taken on April 18, 2019 shows the Yongning Pavilion (front) and the China Pavilion (R, rear) of the 2019 Beijing International Horticultural Exhibition (Expo 2019 Beijing) in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition is slated to kick off on April 29, 2019. (Xinhua/Chen Yehua)