What other techniques are there in this poem besides metonymy?

Metonymy, such as "smoke and dust" instead of border war; Corresponding to the "drum horn" below, the tension of war is highlighted from the perspective and hearing, and the difficulty of the current situation is rendered. Use allusions, such as "Please come forward" and code word "Hanshu". The final army biography "; The poem implies that no one in the DPRK shares the worries for the country, in order to express the poet's deep worries about state affairs.

Rhetoric also has "duality"; There are also puns. For example, "the end of the year" refers to the end of a year, and the author has entered the twilight of his life. It also refers to the Tang Dynasty's transition from prosperity to decline to the stormy late Tang Dynasty. There is a combination of reality and fiction in the description technique, such as "the frontier soldiers are still fighting, the smoke invades the snow ridge" and "who volunteered to go to court" is the author's imagination, but it is imaginary writing; "Drum horns move the river." "Heaven and earth are bleeding every day" is the present situation, and it is real writing. There are contrasts in expression techniques, such as the contrast between the courtiers who came uninvited and the author of Dare to Love Death, a Jianghu person. The author's lofty mind can't compare with serving the country. "When does the economy dare to love to death? Loneliness and fear ",his words and deeds contrast; "Drum Horn Moving the River" implies the comparison between pre-war and post-war; The comparison of thoughts and feelings between the "distant guest" at the beginning of the poem and the "lonely shock" at the end of the poem, and so on.