Suddenly, like a night wind blowing, like a pear tree in blossom. What idiom can express its season?

Sleeping on frost and snow is a metaphor for hard life.

Bai Xuege is a farewell poem, which describes a place near Qilian Mountain and Yumenguan in the northwest plateau.

August here refers to the lunar calendar, or rather August after the Mid-Autumn Festival, which belongs to the end of August. According to the solar term, it should be around "cold dew", and the next solar term is "first frost", that is, the weather begins to turn cold, "it's white, and it's going to frost soon"

The north is colder than the south, and the 24 solar terms are calculated on the basis of the Central Plains and the Yellow River and Yangtze River basins, and are formulated for agriculture. Therefore, the climate in the north is generally more backward than the corresponding solar terms, which means that the solar terms will enter the winter earlier, so the cold dew season in the north will enter a large-scale frost stage. If there are few people and lack of vegetation, a layer of hoarfrost will be like snow, and snowfall in some plateau areas is normal.