Straightness of the tree: ups and downs of career and life.
Yellow leaves: the metabolism of dying mature beauty
Green leaves: vitality, hope and vitality
Bamboo: Honest and positive.
Willows: Farewell to the beautiful willows that miss sadness in spring: it is the custom of farewell in Han Dynasty. After the implication, there is a meaning of farewell and nostalgia. Willow: Sad Feelings
Willows pile up smoke: it can trigger the past, and is often used to express the feeling of ups and downs.
Red leaves: it is called the thing that conveys feelings, and later refers to poetry to convey feelings.
Pine and cypress: Strong and proud, strong and energetic. Pine trees are a model of snow and frost resistance, and naturally they are the object of praise. Li Bai's "Book for Huang Shang": "I hope you are loose, but be careful not to be peaches and plums." Wei always flatters powerful people, and Li Bai writes poems to persuade him to be an upright person. Serina Liu in the Three Kingdoms gave his younger brother: "Don't suffer from cold, pine and cypress are sexual." The poet used this sentence to encourage his cousin to be as loyal as sending pines and cypresses, and to maintain noble quality under any circumstances.