What does the ancient Shu-Han poem in Farewell to Du Fu DuDu express the poet's feelings?

This poem was written to send my friend Du Shaofu to Zhou Shushu. One or two farewell places are in Beijing, which is guarded by the "Sanqin" area, and the place where friends want to go is Zhou Shu, and they want to pass the "Wujin". Three or four sentences express the feeling of parting: because we are all people who go out to be officials, the feeling of parting is the same. Five, leave two words of sincere friendship to encourage Du Shaofu not to be sad because he is far away from his friends, because mountains and rivers can't block the spiritual and emotional communication of intimate friends. These two poems are the epigrams of the whole article, and they have become famous sentences that have been praised through the ages. The last two sentences further encourage Du Shaofu to go to Zhou Shu with a good mood, and don't shed tears when young men and women leave. This farewell lyric poem is vigorous in brushwork, broad in artistic conception, sad and bitter, and full of sincere and profound friendship in encouragement and spur.