The sand sea deepens with the unfathomable ice, and the gloomy and gloomy Wan Li condenses the meaning of the dictionary author.

It means: The desert is frozen, with cracks in both vertical and horizontal directions, and the sky in Wan Li is full of clouds.

"Sand sea ice is unfathomable, and the clouds are dark and Wan Li is condensed". These two poems are from Bai Xuege Farewell to Wu Gui, a poet in the Tang Dynasty. With exaggerated pen and ink, the magnificent snow scene in Sasai was painted, which arranged a typical farewell environment for "military judges returning to Beijing". It is difficult to travel long distances in such cold and bad weather. The word "sadness" vaguely implies parting. These two poems express the poet's feelings of seeing his friends off and the melancholy caused by their return to Beijing.