Literature Reference: 借问陇头水，年年恨何事。全疑呜咽声，中有征人泪。自古无长策，况我非深智。何计谢潺湲，一宵空不寐。—— 《横吹曲辞 陇头水》 I ask the waters of Longtou, what grievance do they hold year after year? Their murmurs seem like sobs, carrying the tears of soldiers. Since ancient times, there has been no lasting strategy, and I am not wise. How can I repay the flowing streams, staying sleepless through the night. Source from 'Hengchuiquci Longtoushui'.