黄鹤楼使至塞上原文？使至塞上王维单车欲问边，属国过居延。征蓬出汉塞，归雁入胡天。大漠孤烟直，长河落日圆。萧关逢候骑，都护在燕然。【译文】我奉命到边防慰问，轻车简...