《太平广记·卷三百四十七·鬼三十》
当时天寒，第二天成为坚冰，城墙象银子一样晶莹，不可攻击。
时寒，来日冰坚，城之莹如银，不可攻击。
The weather was cold at the time, and the next day it became solid ice, and the city wall was crystal clear like silver, and it could not be attacked.