What is the expression of Gu Cheng's parting sea?

a sad feeling of missing. Excerpt: I'm not going to the island to get blue water. I'm going fishing at sea. Those white-haired waves are leaning against the rocks and looking at the old military cap. Among them, the poem expresses a sad feeling of missing, and The Sea of Parting is a poem written by the modern poet Gu Cheng.