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Unit4Wordsandexpressions1.decreasev.减少；降低decrease…by表示数量减少的幅度，即在原有的基础上“增加或减少了多少”；decrease…to则表示“减少到多少”。Practice:1)该城市去年交通事故减少了30%。Thetrafficaccidentsinthecity__________30%lastyear.2)人口去年减少到1百万。Thepopulation____________1millionlastyear.decreasedbydecreasedto2.dieout灭亡；逐渐消失Manyoldcustomshavediedout.Heisthelastofthefamily;afterhisdeaththenamewilldieout.3.huntv.打猎；猎取；搜寻We'llgohuntingintheafternoon.huntfor搜寻huntn.打猎；猎取；搜寻Thetigerhuntbeganatsunrise.Thehuntforthelostchildcontinueduntilshewasfound.huntern.猎人4.inpeace平静地，处于平静状态Allthevillagerslivetogetherinpeace.Pleaseletmedomyworkinpeace.类似短语：insurprise惊奇地inrags衣衫褴楼地intears流着泪；哭5.indangerof有...的危险Thehouseisnowindangerofcollapse.Hewasindangeroflosinghislife.indanger处于危险中你认为中国的熊猫正处在危险中吗?(indanger)DoyouthinkthepandasinChinaareindanger?beoutofdanger脱离危险endangeredadj.濒危的dangerousadj.危险的6.respondv.回答；响应；做出反应Hassherespondedtoyourletter?responsen.反应；回答；响应；答复7.reliefn.(痛苦,负担等的)缓和，减轻；解除inrelief如释重负；松了一口气Hesaidandthensmiledinrelief.toone’srelief使某人松了一口气Tomygreatrelief/Muchtomyrelief,heissafenow.8.burstintoburstinto+n.突然发作，爆发，闯入，冲进burstout+doing突然爆发burstintolaughter/tears=burstoutlaughing/crying9.certainadj.某种(或一定)程度的；确定的becertainof/aboutsth.确信…=becertaintodosth.forcertain/sure肯定地Ican'tsayforcertainwhenhewillarrive.Theyarecertaintosucceed.=Theyarecertainofsuccess.=Theyarecertainthattheywillsucceed.=It’scertainthattheywillsucceed.10.protect…from保护…不受…(危害)Wearingdarkglassescanprotectyoureyesfromthesun.prevent/stop/keep…fromdoingsth.阻止...做...11.containv.包含,容纳；容忍,克制Thisbookcontainsalltheinformationyouneed.Trytocontainyouranger.12.affectv.影响；感动；侵袭Theamountofrainaffectsthegrowthofcrops.Hewasmuchaffectedbythesadnews.effectn.影响，效果haveaneffecton…对……有影响comeintoeffect实施，生效13.payattentionto注意；留意(to是介词)Youshouldpayattentiontoyourspelling.devotetodoingsth.把某人的时间用于(奉献于)做某事be/getusedtodoingsth.习惯于做某事lookforwardtodoingsth.盼望做某事objecttodoingsth.反对做某事sticktodoingsth.坚持做某事getdowntodoingsth.开始做某事后接介词to的动词短语：14.appreciatev.欣赏，赏识；领会；感激；意识到Hertalentformusicwasnotappreciated.Iamafraidyouhavenotappreciatedtheurgencyofthematter.Iwouldappreciateifyouletmehavethatchance.n.appreciation15.succeedvi.成功vt.接替，继任I’msureyou’llsucceedifyouworkhard.Hefinallysucceedinworkingoutthedifficultproblem.TrumpsucceededObamaaspresidentoftheUSA.n.success(U)成功(C)成功的人或事adj.successful16.employvt.雇佣，利用He’snowemployedasateacher.Heisemployedinresearchinghissubject.拓展：employsb.in(doing)sth.=sb.beemployedin(doing)sth.某人忙于某事，从事于某事17.harmvt./n.损害，危害Speecheslikethisdomoreharmthangood.Havetheworkersbeenharmedinthedisaster?拓展：dosb./sth.harm=doharmtosb./sth.adj.harmfulbeharmfultoadj.harmless18.comeintobeing形成；产生Wedonotknowhowtimeandspacecameintobeing.拓展：comeintoeffect:生效comeintopower/office:开始执政，上台comeintouse/service:开始使用19.accordingto按照；根据…所说Accordingtopolicereport,fivecarswerestolenyesterday.