What feelings did Yang Xiucai express when he visited Shu?

This is a farewell poem, which expresses the feelings of being reluctant to part with friends. A friend, Yang Xiucai, wants to visit Shu. He wrote this poem as a gift. Poetry into poetry depends on what he saw and heard all the way through Qutang and into Sichuan. However, according to Zhang Hu's information, the poet visited many places, but there was no record of Qutang and entering Sichuan. What he wrote in the poem was probably imagined according to his knowledge.