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U1.unable[ʌnˈeɪbl]adj不能的；不会的beabletodosthHestoodleaningagainstthewall,abletospeak.2.unbelievableadj难以置信的an~speed，It’s~thatsb(should)do…3.unconscious[ʌnˈkɒnʃəs]adja.未意识到的be~ofsthb.失去知觉的；不省人事的knocksb~Hewasfoundlyingonthesofa,unconscious,4.underprep在…下面runoutfrom~thebed,children~fiveundercontrol/constructionIrepair/way/treatment/discussion/consideration/theleadershipoftheParty在控制中/在建造中/在修理中/在进行中/在治疗中/在讨论中/在考虑中/在党的领导下.5.undergovtundergo-underwent-undergone经受；经历；遭受(不愉快/痛苦的事）~greatchanges经历巨变~hardships/suffering遭受艰苦/痛苦6.underline[ˌʌndəˈlaɪn]vt在…下面划线;强调~themainpoints,theunderlinedword,~theneedforreform7.understandvtunderstand–understood-understood理解；懂Ican’t~his/himtakingthemoneyfully~sth,makeoneselfunderstood/heard8.understandingadj能谅解的；通情达理的You’remost~.n理解(力)；谅解increasethe~betweenthetwocountries促进两国之间的理解antmisunderstanding误解leadtomisunderstanding导致误解9.undertakevtundertake-undertook-undertaken接受；承担(责任/艰苦的工作等）~atask承担任务，bear/assume/take(on)/shoulder/-responsibility(forsth)10.undovtundo-undid-undonea.解开；松开(结/钮扣）undoaknot/apackage解结/包襄b.取消；废除Whatisdonecannotbeundone.事已定局，无可挽回(泼水难收.）11.unexpected[ˌʌnɪkˈspektɪd]adj意外的；未预料到的an~guest不速之客,becaughtinthe~rain12.unfitadj不合适的be~forsth/todosthHe’s~forthejob.Thefoodis~toeat.13.uniform[ˈju:nɪfɔ:m]n制服；校服gotoworkinwearschool~s14.union[ˈju:niən]na.协会trade~工会,ChairmanoftheStudents’Union学生会主席b.联合；团结the~ofthreetownsintoone,Union/Unityisstrength.团结就是力量.15.unique[juˈni:k]adj独一无二的a~opportunity,a~workofart一件独特的艺术品16.unitevt联合；结合~AwithB,~infighting/tofightAIDS,beunitedasone团结如一theUnitedNations联合国Unitedwestand,dividedwefall.合则立，分则裂.17.unknownadj未知的exploretheunknown探索未知的东西，unknowntosb18.untouchedadj未触揽过的；未开发的leavethecakeuntouched/theworkunfinished19.upadv向上Pricesaregoingupdaybyday.eat/useup吃光/用光What’sup?=What’sthematter?Whathashappened?/What’sgoingon?发生了什么事？upanddowna.上下looksbupanddownb.来回move/walkupanddown走来定去uptoa.go/runuptosb走到/跑到跟前b.多达Thecarcancarryupto6persons.c.直到uptonowd.达到，胜任uptothestandard/thejobbeuptosba.由某人决定It’snptoyoutodecide.b.是某人的职责It’suptoustohelpthoseintrouble.c.从事，忙于Ibetheisuptonogood.我敢打赌他没干好事.n.upsanddowns波折；起起伏伏experiencemanyupsanddowns,Lifeisfullofupsanddowns.20.upright['ʌp'rait]adj.a.直立的；挺直的an~oldmanb.正直的berespectedasan~manadv.sit/stand~坐直/站直21.upset[ʌp'set]upset-upset-upsetvt.a.使心烦意乱，打扰Thenewsquiteupsethim.~/disturb/destroythebalanceofnature扰乱/破坏生态平衡b.打翻~abottleofink打翻一瓶墨水c.~one'sstomach使胃不舒服adj.心烦的；不安的；弄翻的feel/be~atnotbeinginvitedn.astomachupset胃不舒服22.urban['ə:bən]adj.城市的~life/areas城市生活/地区ant.rural农村的23.urge[ə:dʒ]vt.催促；激励~sbtodo/thatsb(should)dosthHeurgedustogo/thatweshouldgourgesbon激励某人urgesbon(togreaterefforts)激励…更努力n.冲动；强烈愿望haveanurge(=astrongdesire)todosth很想做某事24.urgent['ə:dʒənt]adj.紧急的；急迫的an~message/cryforhelp紧急消息/呼救bein~needofrepair急需修理，It’smost~thatwe(should)operate.咱们得马上动手术.25.usen.make(full/good)useof,makethemost/bestof充分利用comeintouse开始被使用,in/outof~在使用/不再使用，ofgreatuse=veryusefulputsthtouse使用，It’snouse/nogood/uselessdoingsth.vt.usesthup用完，usesthas用作usedtodo/beusedtodo/beusedtodoing以前总是做/被用来做/习惯于做26.usual['ju:ʒuəl]adj.通常的as~像平常一样,businessas~照常营业，Hearrivedearlierthan~asisusualwithsb某人通常是这样的，Itisusualforsbtodosth.