阅读下面的古诗，回答后面问题。
                                                                                                早寒江上有怀
                                                                                                        孟浩然
                                                             木落雁南度，北风江上寒。我家襄水曲，遥隔楚云端。
                                                             乡泪客中尽，孤帆天际看。迷津欲有问，平海夕漫漫。