(1) The play describes that all three ghosts had a disgraceful experience before their death, and they committed crimes as traitors. Continue to do evil in hell after death, and there will never be peace. They are jealously jealous, intrigue, intrigue, mutual suspicion, mutual obstruction and mutual containment, and no one can do it.
(2) When we are together, everyone can put each other in pain, and everyone becomes each other's hell.
(3) Hell is actually a capitalist society that the author is familiar with. The struggle and conflict of interest between ghosts in hell symbolize the abnormal relationship between people in capitalist society. "Others are hell" has become a famous saying in the relationship between people in western society.