2. Frontier poems, also known as frontier poems, are based on the life and natural scenery of Han soldiers and civilians in the border areas. It is generally believed that frontier poems first developed in the Han, Wei and Six Dynasties, flourished in the Sui Dynasty, and entered the golden age of development in the Tang Dynasty.
3. Yongjia Siling refers to the school of poetry in China in the middle of Southern Song Dynasty, which represents a tendency of poetry creation in the late Southern Song Dynasty. The Four Spirits of Yongjia were four poets who grew up in Yongjia, Zhejiang (now Wenzhou, Zhejiang) at that time: Zhao Xu, Xu Qian, Weng Juan and Zhao Shixiu. In the mid-Southern Song Dynasty, they formed a poetic school in China, representing a tendency of poetic creation in the late Southern Song Dynasty. Because they share the same interests, their poems and styles are similar, and their works are all laws of the Tang Dynasty. In the late Tang Dynasty, Jia Dao and Yao were the laws, so they were called Tang style with the word "Ling", while Wenzhou was always Yongjia County, so they were called "Yongjia Four Spirits".