func.tion as obj v prep [T] 起作用，行使职责 Our spare bedroom also functions as (=performs the purpose of being) a study. 我们的备用卧室也用作书房。 My mother is ill, so I'm having to function as (=perform the duties of ) a nurse at the moment. 我的母亲病了，所以我目前不得不担当起护士的职责来。