The green mountains cannot cover it, and it will flow eastward after all. This is the middle sentence of the poet Jiaxuan's "Bodhisattva Man", and its full poem: Under the Yugu Terrace, there are clear rivers, and many passers-by are crying in the middle. Looking to the northwest of Chang'an, there are countless pitiful mountains. The green mountains cannot cover it. After all, it flows eastward. The river is sad at night, and partridges can be heard deep in the mountains. As for Qingshan's two sentences, I like them very much, not for any other reason than because he revealed an objective truth and revealed a secret. Xin Qiji lived in the corrupt Song Dynasty and wanted to kill the enemy, but was unable to save himself. It was such a cruel experience that gave him a thorough insight into world affairs. The tide of history can be said to be mighty and mighty, surging eastward and unstoppable. Even if a few green hills make it turn a few corners, no one can change the general trend that flows straight to the East China Sea.