Why is Wusong commonly known as Shu Gui?

In cold weather, countless droplets below zero degrees Celsius that have not yet frozen are floating in the wind. When they touch branches and other things below zero degrees Celsius, they accumulate, freeze and condense into white loose ice crystals again, which is called "rime". Commonly known as tree hanging. It is a natural phenomenon similar to the first frost that can often be seen in northern winter, and it is a kind of ice and snow beauty. It is also common in southern mountainous areas, as long as there are supercooled water droplets in the fog.