Why is it a white apple in the poem?

It better expresses the feelings that the poet wants to convey. The color represented by white means refreshing, flawless, cold and simple, so the white apples in poetry can better express the feelings that the poet wants to convey. Poetry is a literary genre that expresses feelings and wishes. It is a literary genre with a certain rhythm and rhythm, which vividly expresses the author's rich emotions in highly concise language and reflects the social life in a concentrated way.