What is the theme of the book of songs "picking Wei"

Picking Wei is a poem written by frontier soldiers on their way home in the Western Zhou Dynasty. It describes his hard life in the frontier and expresses his patriotism and homesickness. ?

The first three chapters of this poem recall the hardships of exploration in flashback. To resist? He has been away from his family for a long time. He is very arrogant. How eager he is to return to his hometown when the border is settled as soon as possible! Chapters 4, 5 and 2 describe the frontier sergeant's expedition to dignity. The whole article is magnificent, and the patriotic experience of soldiers has been fully reflected. At the end of this chapter, I wrote "Let's go home". Although we can survive, the hardships of the past have only brought us today's "hunger and thirst". How can you not be depressed?

This poem is selected from Xiaoya, but it has the characteristics of "national style" folk songs, and attaches great importance to the use of sentence repetition and metaphor. For example, in the repeated sentences in the first three chapters, the words are slightly changed, which sets off the feeling of being away from home for a long time with Wei's growth process, which is extremely vivid and appropriate. The fourth chapter regards the blooming of the Long Beach as a symbol of strong military capability, strict military power and strangeness of the new police. The last chapter, with its scenery before and after the expedition, is filled with endless sadness, shallow words and profound meanings, and the scene is mixed, which has always been regarded as a much-told story of Miao Yan in The Book of Songs. ?