Seven words per line is a multi-sentence nursery rhyme with "Ang" as its rhyme. The tree selected in the poem is representative and conforms to our life. For example, "the leaves of the phoenix tree are like palms, and the pines and cypresses are covered with green all the year round", and the characteristics of the tree are closely related to the children's lives by means of metaphor and personification.
Children's songs also introduced to the children that "kapok in the south likes warmth, while birch in the north keeps out the cold." In this sentence, I like being warm and cold-resistant, north and south. By comparing the two groups of words, let the children feel the different habits of kapok and birch.