From "One of Three Poems on Passing through the Huaqing Palace" written by Du Mu in the late Tang Dynasty
Looking back at Chang'an, there are piles of embroidery, and thousands of doors are opened one after another on the top of the mountain.
The red concubine on horseback smiled, but no one knew it was lychee.
Appreciation: This poem chooses to send lychees to the imperial concubine on her flying horse, which vividly reveals that in order to satisfy her own appetite, the ruler did not hesitate to mobilize troops, waste people and money, and effectively lashed out at Emperor Xuanzong of the Tang Dynasty and Concubine Yang's arrogance and extravagance.
The first two sentences of the poem pave the way for the background, and the last two sentences introduce the main body of the description and hint at the theme of the poem. The two specific images of "Riding in the Red Dust" and "Concubine's Laughter" are presented side by side, which makes people think and leaves people with suspense. Although "no one knows" is three words, it is thought-provoking and intriguing.