Actors perform during a float parade at the site of the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, April 29, 2019. The International Horticultural Exhibition 2019 Beijing opens to the public on Monday. About 2,500 cultural activities, such as parades and performances of world ethnic cultures, will be held throughout the expo.(Xinhua/Chen Yehua)

A float runs during a float parade at the site of the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, April 29, 2019. The International Horticultural Exhibition 2019 Beijing opens to the public on Monday. About 2,500 cultural activities, such as parades and performances of world ethnic cultures, will be held throughout the expo.(Xinhua/Chen Yehua)

A float runs during a float parade at the site of the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, April 29, 2019. The International Horticultural Exhibition 2019 Beijing opens to the public on Monday. About 2,500 cultural activities, such as parades and performances of world ethnic cultures, will be held throughout the expo.(Xinhua/Chen Yehua)

A float runs during a float parade at the site of the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, April 29, 2019. The International Horticultural Exhibition 2019 Beijing opens to the public on Monday. About 2,500 cultural activities, such as parades and performances of world ethnic cultures, will be held throughout the expo.(Xinhua/Chen Yehua)

Actors perform during a float parade at the site of the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, April 29, 2019. The International Horticultural Exhibition 2019 Beijing opens to the public on Monday. About 2,500 cultural activities, such as parades and performances of world ethnic cultures, will be held throughout the expo.(Xinhua/Ren Chao)

Actors perform during a float parade at the site of the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, April 29, 2019. The International Horticultural Exhibition 2019 Beijing opens to the public on Monday. About 2,500 cultural activities, such as parades and performances of world ethnic cultures, will be held throughout the expo. (Xinhua/Chen Yehua)

A float runs during a float parade at the site of the International Horticultural Exhibition 2019 Beijing in Yanqing District of Beijing, capital of China, April 29, 2019.The International Horticultural Exhibition 2019 Beijing opens to the public on Monday. About 2,500 cultural activities, such as parades and performances of world ethnic cultures, will be held throughout the expo. (Xinhua/Chen Yehua)