357 means it is difficult to walk, and it is used to indicate that the road to the left and right difficult mountains can be taken.
Difficult to Go is three seven-character ancient poems by Li Bai, a great poet in the Tang Dynasty, which are selected from Li Bai's school notes and Yuefu miscellaneous songs. These three poems are closely related and inseparable. The whole poem expresses Li Bai's uncontrollable anger after encountering difficulties and obstacles on the political road, but Li Bai did not give up his lofty political ideal because of this.