What is the function of the seventh sentence in Yan 'an?

The use of language has a strong local color. The whole poem adopts the form of northern Shaanxi folk song "Xintian", with two lines and one section, which rhymes with lively form and free rhythm. Extensive use of personification, exaggeration, parallelism and contrast. This poem was written in the form of Pilgrim's Progress, a folk song in northern Shaanxi. "Xintianyou": two lines and one section, usually one section and one rhyme, or several sections with the same rhyme; Multipurpose comparison method. Many times, Xing and China are compared, and comparison and Xing are integrated. Bixing is generally used in the first sentence of a poem. It is a kind of folk song that can be played at will, also known as "Walking the Tianqu". It is a melody that people living in northern Shaanxi are familiar with. It is unrestrained and enthusiastic, full of desolation and simplicity of the plateau.