What is the key to the 24 solar terms at the opening ceremony of the Winter Olympics?

Start with "Rain", count down all the way, and finally reach "beginning of spring".

The opening ceremony of the 2022 Beijing Winter Olympics was held at the National Stadium! There were 24 solar terms before the whole ceremony, starting from "Rain" and counting down to "beginning of spring". February 4, 2022, the opening day of the Beijing Winter Olympics, is also the beginning of the new year of the spring solar term. Twenty-four solar terms are a knowledge system and social practice formed by ancient Chinese people by observing the movement of the sun for one year and understanding the changing laws of the four seasons, climate and phenology in a year.