Enrich cultural connotation and express implicitly and euphemistically.
1. Enrich cultural connotation: Connect poetry with history and culture by quoting allusions or classic quotes to enrich the connotation of the work.
2. Implicit and euphemistic expression: The use of allusions makes the poetic language more refined, and at the same time can increase the richness of the content and the vividness and implicitness of the expression.