1, allusion to a: northern tradition, the last dish is invited to dinner yellow cauliflower, said the yellow cauliflower are cold, is to come late to the feast are going to be scattered.

2, allusion 2: yellow flowers in ancient poetry refers exclusively to chrysanthemums, Su Shi chrysanthemums in the famous line: tomorrow, yellow flowers butterflies are sad, refers to the best time to miss the chrysanthemum, bees and butterflies have no hobby, as a metaphor for things that expire.