品读下面这首诗，按要求回答问题。
                                                                             闻王昌龄左迁龙标遥有此寄
                                                                                           李白
                                                                        杨花落尽子规啼，闻道龙标过五溪。
                                                                        我寄愁心与明月，随风直到夜郎西。