What rhetorical device is used in "The Red Army is not afraid of the difficulties of the expedition"?

Two rhetorical techniques are used:

(1) Duality. These are the two contrasting sentences in Mao Zedong's poem "Seven Rhythms: Long March". In Wuling Dui Wumeng, numerals normally appear and must be relative with numerals, but upper and lower are relative by proper nouns, and the conjunction is allowed.

(2) Exaggeration. Hyperbole rhetoric is mainly divided into two categories: exaggeration and exaggeration. Exaggeration: The general's forehead can run a horse, and the prime minister's belly can punt a boat. Praise for being small: This person’s eyes are smaller than a needle nose. Exaggeration: as bold as a tiger; exaggeration: as timid as a mouse. In fact, the concepts of exaggeration and exaggeration are to exaggerate to the two extremes of antonyms. For example, praising a fragrance as "the fragrance floats thousands of miles" and praising a smell as "stinking to the sky" are exaggerating to the opposite poles. Sometimes exaggeration and exaggeration appear at the same time, for example: the greedy snake (exaggeration) and the swallowing elephant (exaggeration). The two sentences in the example sentences are both exaggerated to two extremes in one sentence: First, they say that Wuling and Wuhao are extremely huge, and then they exaggerate to Jue Xiao: Wuling stretches for thousands of miles, but under the feet of the Red Army soldiers, it is just a soaring There was a small wave; the Wumeng Mountains were majestic, but under the feet of the Red Army, it was like walking through a small mud ball.