A visitor takes photos of orchids during the Orchid Show at the Chicago Botanic Garden in Glencoe of Illinois, the United States, on Feb. 27, 2020. The Orchid Show is held at the Chicago Botanic Garden in Glencoe of Illinois from Feb. 8 to March 22. (Photos: Joel Lerner/Xinhua)

A visitor takes photos of orchids during the Orchid Show at the Chicago Botanic Garden in Glencoe of Illinois, the United States, on Feb. 27, 2020. The Orchid Show is held at the Chicago Botanic Garden in Glencoe of Illinois from Feb. 8 to March 22.

A visitor takes photos of orchids during the Orchid Show at the Chicago Botanic Garden in Glencoe of Illinois, the United States, on Feb. 27, 2020. The Orchid Show is held at the Chicago Botanic Garden in Glencoe of Illinois from Feb. 8 to March 22.

Visitors view orchids during the Orchid Show at the Chicago Botanic Garden in Glencoe of Illinois, the United States, on Feb. 27, 2020. The Orchid Show is held at the Chicago Botanic Garden in Glencoe of Illinois from Feb. 8 to March 22.

Visitors view orchids during the Orchid Show at the Chicago Botanic Garden in Glencoe of Illinois, the United States, on Feb. 27, 2020. The Orchid Show is held at the Chicago Botanic Garden in Glencoe of Illinois from Feb. 8 to March 22.

Visitors view orchids during the Orchid Show at the Chicago Botanic Garden in Glencoe of Illinois, the United States, on Feb. 27, 2020. The Orchid Show is held at the Chicago Botanic Garden in Glencoe of Illinois from Feb. 8 to March 22.

Orchids are seen during the Orchid Show at the Chicago Botanic Garden in Glencoe of Illinois, the United States, on Feb. 27, 2020. The Orchid Show is held at the Chicago Botanic Garden in Glencoe of Illinois from Feb. 8 to March 22.