Ancient prose implying a bad mood

Provide a poem "Spring Hope" by Du Fu, a poet in the Tang Dynasty;

Although a country is divided, mountains and rivers still exist.

Trees and grass turn green again in spring.

Petals shed like tears,

Lonely birds sang their sorrows.

After three months of fighting,

Letters from home are priceless.

I stroke my white hair. It became too thin,

I can't hold the hairpin anymore.

Among them, "Where the petals have fallen like tears, and the lonely bird has sung grief" expresses the feelings of worrying about the country and the people and feeling sorry for themselves, and personifies the technique, which is extremely vivid.