As soon as the poem is sent to princess mortals, what is the next sentence?

Tang Du Mu's Poems of Crossing the Qing Palace in China

Chang 'an looked back and embroidered.

There are thousands of doors open on the top of the mountain.

As soon as I ride the world of mortals and laugh,

No one knows it's litchi.

The first sentence "Looking back at Chang 'an" is extremely important. At that time, Chang 'an was the capital, Ming Chengzu was busy in the capital, and his concubine was staying in the capital, so the people who flew litchi went straight to Chang 'an, while Ming Chengzu and the imperial concubine were having fun in Lishan! This is the scene of "Chang 'an looking back and embroidering in the pile". During the reign of Emperor Ming of the Tang Dynasty, Mount Li was planted with cotton embroidery-like flowers and trees, so it was called Xiuling. Write the general appearance of Mount Li in the distance vividly with "embroidered piles". The second sentence is "pile embroidery" to write about the building of Huaqing Palace in Lishan Mountain. At this time, "one ride" is close to Mount Li, only to see "a thousand times at the top of the mountain"; People on the mountain have seen the "world of mortals" flying and "one ride" coming, so they opened the "thousands of doors on the peak" for the second time. As a result, there was a dramatic scene of "laughing at the world of mortals". On the one hand, it is a high-speed day and night gallop that rolls up the "world of mortals", bringing litchi "a journey", sweating like rain and suffering; On the other hand, the imperial concubine got fresh litchi. She smiled and was overjoyed. In contrast, it contains a silent condemnation of luxury life. The first three poems didn't mention litchi at all. I don't know why I want to look back at Mount Li from Chang 'an. I don't know why "thousands of doors on the peak" open one after another, and I don't know what "riding the world of mortals" is for, and why "concubines" are laughing, leaving readers with a series of suspense. The last sentence should explain the suspense, but I didn't expect to use a negative sentence: "No one knows it's litchi." Indeed, the wind blows the dust, "riding" the thousands of doors of Huaqing Palace, which are open to him from the foot of the mountain to the top of the mountain. People will think it's urgent news about the military. How can you imagine that it is litchi for the imperial concubine! The word "unknown" makes the finishing point and has profound implications, which raises the ideological realm of the whole poem to an amazing height.

The beacon tower in Zhou Youwang is also on the top of Mount Li. The author asked Yang Guifei to watch Riding the Red Dust at the top of Mount Li, and deliberately used the word "princess smiles" to remind readers of the historical lesson of "praising the princess and smiling at Zhou".