The sand sea deepens with the unfathomable ice. How to appreciate Wan Li Ning when the clouds are gathering?

The vast sand sea is full of ice and snow; Snow presses the winter clouds, thick and dense. Although the snow is suspended, it seems that the weather will not improve in the short term. "The sand sea deepens the ice depth, the clouds are bleak, and the Wan Li is condensed", two sentences use exaggerated pen and ink to draw a magnificent snow scene in Sasai, which arranged a typical farewell environment for Judge Wu's Return to Beijing and set off the poet's parting thoughts. It is difficult to travel long distances in such cold and bad weather. The word "sadness" vaguely implies parting. Among them, the word "melancholy cloud" is also beautiful and full of emotion, because this article only plays a transitional role in the whole article.