What is the line in Mulan Poetry that uses couplets to write about the night scene of the border poem and the coldness of the military camp?

Sentence: The new air transmits the sound of a golden watchman, and the cold light shines on the iron clothes.

Translation: The cold air in the north transmits the sound of the watchman's watch, and the cold moonlight shines on the armor of the generals.

This sentence is from the third paragraph of Mulan's Rhetoric, which summarizes Mulan's ten years of campaigning life. "Ten thousand miles to the military opportunity, Guanshan Du Ruo Fei", summarizes the content of the above "Dan Rhetoric ......" eight sentences, exaggeratedly depicted Mulan across the war horse, ten thousand miles, running to the battlefield, flying over a pass, a high mountain;

This sentence is from the third paragraph of "Mulan Rhetoric". The "new air spreads the golden watchman, the cold light shines on the iron clothes", which tells the night scene of the border and the coldness of the barracks.

And "generals die in a hundred battles, strong men return in ten years," summarizing the war is long, fierce and tragic battles. Generals ten years of war, through a brutal battle, some died in battle, some returned. The valiant Mulan, on the other hand, was one of the generals who were fortunate enough to survive and return victorious.

The poem portrays Mulan as an immortal character, both legendary and genuinely moving. Mulan is both a strange woman and an ordinary person, both a heroine and a common girl, both a sturdy warrior and a delicate daughter. She is hard-working and kind-hearted and resolute and brave, simple and plain and quick-witted and lively, loves her relatives and serves her country, and loves peaceful life without admiring her high position and wealth.

In the past, it was believed that Mulan Poetry was produced on the basis of the social customs of the Northern Dynasties, which were still in favor of martial arts. However, the mainstream of the historical development of the Northern Dynasties was the acceptance of the agricultural civilization by the nomads living in Northern China, and then the acceptance of the Chinese culture, which was eventually transformed into the Chinese culture. In this poem, even if Mulan's family was originally from the Xianbei ethnic group, it has long been sinicized. "Mulan when the household weaving", is a proof. Mulan's return to her family and the deep sense of honor in the family's celebration is another proof.

Specifically, Mulan's joining the army on behalf of her father is a high manifestation of her love for her parents and her loyalty to the motherland, which is a high manifestation of the spirit of Chinese culture. Therefore, it should be said that the foundation of Mulan Poetry is the fusion of traditional Chinese culture and the martial customs of the Northern Dynasties, and the fundamental spirit of Mulan Poetry is the spirit of Chinese culture.