There is neither color description nor gesture description in the poem, which is simply unremarkable at first glance. But if you savor it carefully, you will find that it is not only dignified and simple, fresh and elegant, but also novel and unique and thoughtful. Imagine that snow is silent and tasteless and can only be distinguished from color, shape and posture, but in the dark night, the image of snow is naturally difficult to capture. But it is from this special situation that Bai Juyi, who is willing to innovate, narrates from four levels: touch (cold), vision (light), feeling (knowledge) and hearing (smell) in turn, twists and turns, and makes the best use of everything and feelings.