As是这个短语里的介词。
as
读音：英 [æz , əz] 美 [æz , əz]
释义：像;如同;作为;当作。
as作“以…的身份,以…资格,作为，以…角色”解时，act,employ,function,serve,speak,work或形容词eminent,distinguished,famous,known,recognized,renowned等连用。
as比较常用于as...as和the same...as两个句型。
相关词组：
as strong as brandy 跟白兰地一样厉害。
as stubborn as a mule 像骡子一样固执。
as stupid as a coot 笨头笨脑的。
as stupid as a donkey 笨得像驴。
as stupid as a goose 非常笨。
as stupid as an ass 笨得像驴。
as stupid as an owl 笨透的。
as sulky as a bear 怒气冲冲。
as sure as a gun 一点不错。
as sure as death 〈非正〉毫无疑问的（地）。
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