Tourists visit the Beijing Garden at the Beijing International Horticultural Exhibition in Yanqing District of Beijing, capital of China, May 10, 2019. The Beijing International Horticultural Exhibition has welcomed a large number of tourists from home and abroad since the opening. As of May 9, it has seen more than 500,000 visitors, according to the Beijing International Horticultural Exhibition Coordination Bureau. [Photo / Xinhua]

Tourists visit the Beijing Garden at the Beijing International Horticultural Exhibition in Yanqing District of Beijing, capital of China, May 10, 2019. The Beijing International Horticultural Exhibition has welcomed a large number of tourists from home and abroad since the opening. As of May 9, it has seen more than 500,000 visitors, according to the Beijing International Horticultural Exhibition Coordination Bureau. [Photo / Xinhua]

Tourists visit the Beijing Garden at the Beijing International Horticultural Exhibition in Yanqing District of Beijing, capital of China, May 10, 2019. The Beijing International Horticultural Exhibition has welcomed a large number of tourists from home and abroad since the opening. As of May 9, it has seen more than 500,000 visitors, according to the Beijing International Horticultural Exhibition Coordination Bureau. [Photo / Xinhua]

Tourists visit the Beijing Garden at the Beijing International Horticultural Exhibition in Yanqing District of Beijing, capital of China, May 10, 2019. The Beijing International Horticultural Exhibition has welcomed a large number of tourists from home and abroad since the opening. As of May 9, it has seen more than 500,000 visitors, according to the Beijing International Horticultural Exhibition Coordination Bureau. [Photo / Xinhua]