It is hard to laugh when the river dies, and the birds have occupied the phoenix nest. What do you mean?

Here refers to the death of the river, which means that the past time is gone forever, and the once happy time is gone forever, so it is hard to make people laugh. Swallows occupy the phoenix nest. "Pigeons occupy the magpie's nest" means that others have taken away his home, which should be understood as someone or something they once liked has been taken away by others. The person I once loved married someone else, and things have changed, but I can't help it.