act /ækt/ ► SEE ALLact as sthact for sbact on sthact on behalf of sbact on sb’s behalfact sth outact up act upon sth●ˈact as sthto perform a particular role or function充当（角色）；担任（工作）；起…作用◆Will you act as interpreter for us? 你做我们的翻译好吗？◆Large fines act as a deterrent to motorists. 高额罚金对驾车人有威慑作用。OBJagent, consultant, intermediary, go-between, deterrent SYNserve as sth[v + prep]●ˈact for sb ( ˌact on beˈhalf of sb, ˌact on sb’s beˈhalf) if sb acts for you or acts on behalf of you, they deal with your affairs for you, for example by representing you in court, or by doing your duty when you are not able to代表某人（办理事务、出庭、履行职责等）◆Do you have a solicitor acting for you? 你有代理律师吗？◆The Prince was acting on behalf of the Queen. 当时王子代表女王行使权力。◆The Prince was acting on the Queen’s behalf. 当时王子代表女王行使权力。OBJclient[v + prep]●ˈact on sth ( ˈact upon sthmore formal) 1.to do sth as a result of advice, information, instructions, etc. that you have received遵照…行事；根据…办理◆The police were acting on information from a member of the public. 警方根据一名群众的举报采取了行动。◆I was just acting on instructions. 我不过是奉命行事而已。◆If my advice had been acted upon, this would never have happened. 当初要是听从我的建议，绝对不会发生这种事情。OBJadvice, information, instructions2.to have an effect on sth影响；作用于◆The drug acts on the central nervous system. 这药会对中枢神经系统产生影响。[v + prep]●ˌact on beˈhalf of sb●ˌact on sb’s beˈhalf➡act for sb●ˌact sth ˈout1.to perform a story or events that have happened or might happen, as if you are performing a play将…表演出来◆The teacher read a story and the children acted it out. 老师讲故事，孩子们把故事表演出来。◆She acted out her fantasies of pop stardom in front of her bedroom mirror. 她在卧室镜子前手舞足蹈，幻想自己成了流行歌星。◆ (figurative) The whole nation was following the drama being acted out on the football field. 举国上下都在关注足球场上正在上演的精彩戏码。OBJstory, fantasy2.to act a part in real life扮演（现实生活中的角色）◆I found myself acting out the role of good, brave patient. 我发觉自己是个勇敢的好病人。3. (technical术语) to express your thoughts and feelings in your behaviour, often without being aware of it（常指不自觉地）流露，表露（思想和情绪）[v + adv + n][v + n/pron + adv]●ˌact ˈup (informal) 1.to make sb annoyed by behaving badly, trying to get attention, etc.捣蛋；调皮；淘气◆The kids have been acting up all day. 孩子们一整天都在闹个没完。2.if a machine or part of the body acts up, it does not work as it should（机器或身体部位）出毛病，不正常◆The car’s acting up again. 车又坏了。◆My ankle is acting up (= is painful and causing problems). 我的脚踝疼了起来。SYNplay upNOTEAct up is often used in the progressive tenses. * act up 常用于进行时。[v + adv]●ˈact upon sth➡act on sth