These three sentences are about the lofty ideal of worrying about the country and the people. Du Fu showed his broad mind by putting his predicament on others. These three sentences, seven before and after, and nine in the middle, are consistent, which constitute a vigorous rhythm and momentum, and appropriately show Du Fu's unrestrained passion and fiery hope from his painful life experience in Generation. This kind of passion and hope can't be stopped, which in turn leads to a sigh of "alas". After reading this, we will know that Du Fu did not describe his own pain in isolation and simply, but expressed the pain of "poverty in the world" by describing his own pain to show the destruction of society and the disaster of the people. Not only did he sigh and lose sleep for his misfortune, but he also cried soberly, hoping that someone would come out and seek benefits for millions of poor people. This passionate feeling of worrying about the country and the people and the lofty ideal of urgently demanding to change the dark reality have been affecting the hearts of readers for thousands of years and have a positive effect! !