An explanatory word in the eight-character batch word

It is not a word, nor a noun, but a common combination of branches in eight characters. If the sky is dry on the day you were born, then your god of food is B, and your seal is the unity of branches and branches, then last year's Yi You year is a fleeting food seal for you. A fleeting food seal is not necessarily fierce or auspicious. The key is how well your life is combined with fleeting branches and leaves.