夜上受降城①闻笛
                                                                                                                       【唐】李益
                                                                                 回乐烽②前沙似雪，受降城外月如霜。
                                                                                不知何处吹芦管③，一夜征人尽望乡。
                 【注解】①受降城：回乐县的别称。②回乐烽：唐代有回乐县，灵州治所，在今宁夏回族自治区灵武县西南。回乐烽即当地烽火台。③芦管：笛子。