Photo taken in Tokyo, Japan, Jan. 6, 2020, shows a calligraphy poster exhibited at the preview of Tokyo 2020 Official Art Poster Exhibition. Photo:Xinhua

Photo taken in Tokyo, Japan, Jan. 6, 2020, shows a calligraphy poster exhibited at the preview of Tokyo 2020 Official Art Poster Exhibition. Photo:Xinhua

Press take photos at the preview of Tokyo 2020 Olympics Official Art Poster Exhibition in Tokyo, Japan, Jan. 6, 2020.Photo:Xinhua

A journalist watches a poster at the preview of Tokyo 2020 Olympics Official Art Poster Exhibition in Tokyo, Japan, Jan. 6, 2020. Photo:Xinhua

Reporters visit the preview of Tokyo 2020 Olympics Official Art Poster Exhibition in Tokyo, Japan, Jan. 6, 2020. Photo:Xinhua

Reporters visit the preview of Tokyo 2020 Olympics Official Art Poster Exhibition in Tokyo, Japan, Jan. 6, 2020. Photo:Xinhua

Reporters visit the preview of Tokyo 2020 Olympics Official Art Poster Exhibition in Tokyo, Japan, Jan. 6, 2020. Photo:Xinhua