It is a metaphor for people to actively expand their careers and live in the sun, which means that the New Year's "Peach Blossom Luck" is good and happy events are repeated. It can also be used to describe that the whole thing is developing more actively and full of vitality.
This sentence comes from Wei's Seven Laws of Spring. Peach blossoms are in the sun, and swallows look at each other. The spring rain is continuous, and everything is warm and windy. The hum of the green rain is fresh, and the Yan dance is beautiful and talented. Life on the waterfront is a jade account, and the riverside guest dreams of Yuntai. This is a poem describing the scenery in spring, praising the beautiful natural environment and human life.