Performers are seen on China Pavilion Day of the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday. (Photos: Xinhua)

Performers are seen on China Pavilion Day of the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday.

Tourists visit China Pavilion at the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday.

Performers are seen on China Pavilion Day of the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday.

Tourists visit China Pavilion at the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday.

Tourists queue to enter China Pavilion at the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday.

Tourists visit China Pavilion at the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday.

Tourists visit China Pavilion at the Beijing International Horticultural Exhibition in Beijing, capital of China, on June 6, 2019. The expo kicked off its China Pavilion Day event on Thursday.