(2) The purpose of the author's writing in this way is to arouse readers' imagination, secretly write about the prosperity of Wuyi Lane in the past, play a role in highlighting the contrast between the past and the present, and arouse the feeling of vicissitudes of the world.
(1) The nostalgic poems of the Tang people generally involve the combination of reality and fiction or the comparison and contrast. Either way, there is a contrast between the present scene and the past scene. The scenery in front of us is desolate and decadent, which enables the author to give birth to a feeling that the prosperity of the past has fallen, things have changed, and the vicissitudes have changed dramatically. Therefore, the "wild flowers" and "sunset" in the poem are both scenes of decline and depression.
(2) The author imagines the wildflowers and Wuyi Lane in front of him and thinks about what the giants should look like in those days. The author's arrangement of this "time travel" swallow is nothing more than to make readers associate and imagine, so as to show the feeling that time flies and things have changed.