What expression techniques are used in the poem Longtou Xing?

Mainly using contrasting techniques,

On the one hand, this poem describes the fall of Liangzhou City and the suffering of the Chinese nation. On the other hand, it also expresses the people who were robbed and enslaved and how they felt about recovery. Freedom, the ardent desire to return to the motherland. "Who can make Li Qingche take Liangzhou into the Han family?" Where is the general who can save the people from water and fire? In the late Tang Dynasty, the Tubo people declined. Tang general Zhang Yichao led the "Guiyi Army" to regain the old lands of Hexi and Longyou, and incorporated the "Five Dingnan Prefectures" into the territory of the Tang Dynasty. Hexi Longyou returned to China until the collapse of the Guiyi Army.

"Longtou Xing"

Era: Mid-Tang Dynasty

Author: Zhang Ji

Genre: Yuefu

Longtou Road was blocked and people could not reach it, so Hu Qi entered Liangzhou City at night.

The Han soldiers fought to death everywhere and wiped out Longxi.

Drive the people around me into Huzhong and let the cattle and sheep eat grain and millet.

Last year I raised my children in China, now I wear felt fur and learn the Hu language.

Who can make Li Qingche take Liangzhou into the Han family?