A: The title of Wuguan L is an ancient poem. The author entered the land where Qin never came back through Chu Huaiwang, and created this poem with nostalgia for the past. This poem is full of ambition, helpless pain, deep concern for the country and the people, admiration for the sages, sentimental feelings, and inspiring charm. By talking about the whereabouts first, Wuguan triggered nostalgia, pointing out that Chu Huaiwang was fatuous and died in a foreign land; By comparing Zheng Xiu with Qu Yuan, one praises and the other disparages, showing the image that Qu Yuan cares about the country and the people. By writing about the future, the past is like smoke, and everything is empty, but the ravine still exists, but it is actually "empty" but not empty, revealing a history of meditation and anxiety about reality. Finally, it is a good wish to the Tang Dynasty, but it implies a doubt about whether the Tang Dynasty can defend its territory. This poem is deep and implicit, which is thought-provoking.