Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)

Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)

Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)

Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)

Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)

Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)

Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)

Aerial photo taken on Oct. 6, 2019 shows the China Pavilion at the International Horticultural Exhibition in Yanqing District of Beijing, capital of China. The 2019 Beijing International Horticultural Exhibition will be closed on Oct. 9. Since its opening in April, the expo has held 3,284 events, attracting 9.34 million visitors. (Xinhua/Cai Yang)