Regarding the two poems in "Yong Snow", Xie An thinks that Xie Daoyun's poems are excellent, while Hu'er's poems are not as good as Xie Daoyun's. The author Liu Yiqing's views are the same as Xie An's.
Why are the words and sentences written by Xie Daoyun better? The metaphor pays attention to the shape: big clumps of snowflakes are falling, and if there is wind, they will fly all over the sky. The clumps of catkins, similar to goose feathers and heavy snow, will also fly all over the sky due to the wind. There is a sentence in the ancient poem "catkins pond has a gentle breeze". The flying white snow and the catkins blown by the wind give people a feeling of lightness, elegance and elegance. Using "catkins blowing up due to the wind" as a metaphor for "white snow" can be said to be similar in shape and scene. Salt and snowflakes have different shapes and different weights. "Salt in the air" cannot be blown by the wind even when the breeze blows. The metaphor "white snow" is not very appropriate.