1.act as (臨時(shí))擔(dān)任,充當(dāng),起……的作用.如：A trained dog can act as a guide to a blind person.經(jīng)過訓(xùn)練的狗可以擔(dān)任盲人的向?qū)?表示擔(dān)任獨(dú)一無二的職務(wù),其前通常不用冠詞.如：He acted as manager in my absence.我不在時(shí)他擔(dān)任經(jīng)理.I don’t understand their language; you’ll have to act as interpreter.我不懂他們的語言,你得當(dāng)翻譯了.
2.act for 代理(某人職務(wù)),代為(處理某事).如：Please act for me during my absence.我不在時(shí)請代理我處理事務(wù).I acted for our captain while he was in hospital