2. This poem is from Du Mu's Three Poems of China Passing through the Qing Palace, Part One.
3. Full text: Chang 'an looks back at the embroidered pile, and the top of the mountain opens a thousand doors. As soon as I rode on the smile of smoke and smoke, no one knew that the fresh fruit litchi was sent from the south.
4. When Du Mulu arrived in Chang 'an via Huaqing Palace, he felt that Tang Xuanzong and Yang Guifei were extravagant and misunderstood the country.
5. According to "The Biography of Yang Guifei in the New Tang Dynasty", "I love litchi, and I will be born, so I ride it, travel thousands of miles, and my taste has not changed, and I have arrived in the capital". Therefore, on the way from Sichuan to Chang 'an, many policemen were exhausted and horses fell to their deaths.