What does the poem Wang Tengge mean?

Poetry, Linjiang Pearl, singing and dancing. The painted building faces Nanpu Cloud, and the bead curtain rolls up the rain in the western hills at dusk. The shadow of the idle cloud pool is long, and things change for a few years. Where is the emperor in the cabinet today? Outside the threshold, the Yangtze River flows by itself. [Note] Jiang: A general. Di Zi: Wang Teng. Threshold: Jian railing. The high Wang Tengting is by the river, and the luxurious singing and dancing of Yu Pei and Luan Ling have stopped. Draw a building in Nanpu in the morning and fly to the clouds; At dusk, the bead curtain is caught in the rain in the western hills. The shadow of idle clouds is reflected in the river, and time is endless; Scenery changes with seasons, constellations and directions, and it takes several spring and autumn. Where is Wang Teng in the Cabinet now? Only the Yangtze River outside the railing flows freely. [Appreciation] This poem was originally attached to the Preface to Wang Tengting, and the "four rhymes" in the sentence "All four rhymes are achieved" at the end of the preface is borrowed from this poem. Due to the great influence of the preface, the artistic value of this poem has been obscured. Many readers only know Wang Bo's Preface to Tengwangge, but don't know Wang Bo's Poems of Tengwangge. The first sentence of the poem "Zhu" is directed at the theme, and the word "Lin" shows Ge's high potential. The second sentence, from today to now, when the poet thinks that Wang Teng, who built this pavilion in those days, came to the pavilion in a coach and Yu Pei, and held a luxurious and prosperous banquet, he can't help feeling disappointed. In the third and fourth sentence, the painting building flies to Nanpu Cloud, and the bead curtain is involved in the rain in the western hills. Here, the poet exaggerates not only the condescending situation of Tengwang Pavilion, but also the desolate and lonely situation of Tengwang Pavilion. Melt feelings into the scenery and send gifts to distant places. In the sentence "Clouds and shadows are leisurely", when the brushwork changes from empty to empty, the word "leisurely" points out the long time. The sixth sentence naturally gives birth to the feeling that things change stars, constellations move, and year after year. In the last two sentences, after asking the question of where the builder is now, the poet ended up with a seemingly unsolvable scene, further expressing his feelings about the ups and downs of life and the eternity of the universe. The sentence "The Yangtze River flows freely outside the threshold" is similar to Li Bai's poem "Just watch the Yangtze River flow in the sky". Wang Bo's Poem of Tengwangge is the best poem in all previous dynasties. The poem summarizes the content of the preface with concise and implicit words, with lofty bearing and grand realm, just like the preface to Tengwang Pavilion, which comes down in one continuous line and complements each other.