Judging from the poems of Gao Shi and Cen Can, what are the frontier poems in Tang Dynasty?

The prosperous Tang Dynasty was the heyday of frontier poetry creation, and the famous frontier poetry school appeared, with representative poets such as Gao Shi, Cen Can, Wang Changling, Li Qi and Wang Wei. Gao Zhi's seven-character poems, such as Yan Ge Xing, Cenzhi's Bai Xuege and Zou Ma Zhuan Xing, represent the bold, bold, bold and romantic aesthetic style of frontier poems in the prosperous Tang Dynasty.