There is only one Tang poem, which writes a different artistic conception, which makes people feel faint sadness and full of yearning and admiration for the person they are looking for. This poem is the last words of the famous poet Jia Dao, and Jia Dao is a poet known for his "thoughtful". It is generally believed that he only works hard on the use of words. In fact, his "scrutiny" is not only focused on hammering words and sentences, but also painstaking in article design.