Photo taken with a mobile phone shows a scene at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 30, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows the INBAR (International Bamboo and Rattan Organization) Garden at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 24, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows people visiting the China Pavilion of the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 25, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows an exhibition at the China Pavilion of the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 25, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows people visiting the China Pavilion of the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 25, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows an exhibition at the China Pavilion of the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 25, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows an exhibition at the China Pavilion of the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 25, 2019. (Photo: Xinhua)