39. For members of the seventeenth-century Ashanti nation in Africa, animal-hide shields with wooden frames were essential items of military equipment, a method to protect warriors against enemy arrows and spears.
查了张道真的语法书,里面说as作为连词,可以引起表示原因、时间、比较等的状语从句,还可以引起as you know之类的状态从句,此外,还可以引起一个短语或单词,如regard X as。。。,we must unite as one。等。但是没有说到as+名词这种方式。大概是因为as作连词,要么引起状语从句,要么跟名词作为某个谓语的补语,没有其他用法吧。