1. Emotional expression: Poetry is an emotional expression that conveys the poet's inner feelings through language and images. The connotation of poetry includes the poet's profound experience and sentiment on life, nature, society and other aspects, as well as the resulting thoughts and feelings.
2. Symbol and metaphor: The poem uses rhetorical devices such as symbol and metaphor to express abstract concepts and ideas through concrete images and imagery. This expression makes this poem vague and open, and makes readers get different understanding and enlightenment from it.