《梦溪笔谈·故事一》
其次是卫仗。卫仗，对照阑入宫门法，就是古代的外仗。
其次卫仗，卫仗者，视阑入宫门法，则古之外仗也。
Next came the guards. Comparing it with the method of entering the palace gates described in "Regulations on the Barriers", this was the ancient equivalent of external guards.