Photo taken with a mobile phone shows flowers at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 29, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows flowers at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 29, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows flowers at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 29, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows flowers at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 29, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows flowers at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 29, 2019. (Photo: Xinhua)

Photo taken with a mobile phone shows flowers at the Beijing International Horticultural Exhibition in Beijing, capital of China, on May 29, 2019. (Photo: Xinhua)