This sentence comes from a poem "Farewell to Ancient Grass" by Bai Juyi, a poet in the Tang Dynasty: "Firecrackers start again and time flies." It means that during the Chinese New Year, when I hear firecrackers, I raise my glass to celebrate and sigh that time flies and time flies, which makes people feel a little flustered and uneasy. It expresses that people can't help but feel that time is in a hurry and life is short. We should cherish the present and seize every moment. It also reflects people's love and inheritance of traditional culture and awe of nature and history.