As and like are prepositions or conjunctions. The prepositions as and like have different meanings. As + noun …
as最普通的用法有：1、说明某人或某物的职业、职务、用途、作用。 2、对动作或情况加以比较，说明它们之间有相似之处。 例如： I used …
Grammar explanation. as and like are often confused since they can both be used for comparisons. There are, however, important differences. Making comparisons. as + adjective + as and as much as. We often use the structure as + adjective + as or as much as to say if something has, or doesn't have, the same amount of that quality as something else.
更多内容请点击：Using 'as' and 'like' | LearnEnglish - British Council 推荐文章