Please explain the meaning of this poem in detail.

Let me explain to you, the first sentence is "Bixi is always appreciated". Clear and transparent streams are places we often admire. The second sentence "Judy suddenly went to glory" and "Judy" refers to the rich and luxurious palace, and the rich and luxurious palace has become more prosperous. The implication is that Zhang Langzhong was promoted. The third sentence "I am homesick" is an adverb, which has the feeling of missing you in the future. The fourth sentence, "the text has gone up" (I still want to) listen to your piano. The meaning of this poem is simple and obscure, but it just shows Meng Haoran's long literary foundation. I'll give you a message: when the poet learned that his friend was promoted, he thought of the past, fearing that it would be difficult to see him again, to hear his piano music, and to describe his unwillingness to meet his friends. As the saying goes, it is difficult to meet him, and I am afraid it will be difficult to meet his friends in the future.