A man hits a baseball at the Xiaoshan Guali Sports Center in Xiaoshan district, Hangzhou. [Photo/hangzhou2022.cn]

Editor's Note: The organizing committee of the 19th Asian Games Hangzhou 2022 has listed the top 10 keywords of 2021.

Pre-registration for athletes attending the 19th Asian Games and 4th Asian Para Games in Hangzhou in September 2022 has ended and the official registration system was launched in December 2021. Athletes can register from Dec 10, 2021 to May 10, 2022. Media personnel can register from Nov 10, 2021 to April 10, 2022.