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1、四级常用词根及前缀、后缀1.常用词干（68个）ag,act做agent,active;aster,astro星disaster,astronomy;audi听audience,audio-visual(AV);cap,cept,ceive拿、取capture,receive;bio生命biochemist,antibiotic;cede,ceed,cess行、移动procedure,successive;cide,cis切，杀suicide,decision;clued,clus闭合include,exclusion;cur,curr跑
2、occur,currency;cred相信creditor,incredible;cycle圆、环bicycle,recycle;fac,fic,fect,fact做、制affect,fiction,infect;dict,dic说dictionary,indication;duct,duc引导educate,conduct,prouuce;fer运送、带transfer,conference;flect,flex弯、曲reflect,flexible;flu流fluid,influence,fluent;gen起源、种类、人种inte
3、lligence,generation;geo地球、土地geography,geometry;grad,gress走gradual,aggressive;gram写、记录grammar,telegram;graph写、记录;photo光photograph;ject投、掷、抛reject,project,injection;med中间immediately,medium;lect,leg挑选、采集、读elect,collect,legend;mob,mot,mov移动automobile,promotemani,manu手manual,
4、manipulate;miss,mit送、派、放开transmit,permit;pel推、逐expel,propeller;pend悬挂indispensable,suspend;phon声microphone,phoney;pon,pos放置postpone,compose;port搬运、带transport,portable;rupt裂、破坏interrupt,rupture;scribe写describe,prescribe;spec,spect,spic看perspective,respective;volv转、滚动revol
5、ve,revolution;tract拖、拉、吸引tractor,attract,distraction;vid,vis看见evident,invisible;tend,tens,tent伸张、倾向extend,intense2.常用前缀（49个）anti-反、抗、对立antisocial,antibody;auto-自己/动的autobiography,autonomous;be-使得、视作become,belittle;bi-两，双面bilingual,bimonthly;centi-百century,centigrade;co-共
6、同，联合coordinate,cooperate;con-,col-,com-,cor-与、和、共、全colleague,combination,conform,coordinate;contra-相反、针对contradiction,contrary;counter-反、逆对、等counteract,counterpartde-取消、脱离、向下decline,departure;dis-否定、除去discriminate,disorder;en(m)-使成为、使进入enable,enclose;ex-向外、出自、超出、离开exceed
7、,excludeextra-越出、超过extraordinary,extreme;fore-前面、预先forehead,forecast;in(m)-,il-,ir-不，无，非illegal,important;in-在……里，内部inclusive,indoor;inter-互相、在……中间interaction,intervene;intra(o)-内部、向内introduce,introvertmacro-大的、宏观的macroeconomics;mal-坏、恶、不良maltreat,malnutritionmicro-微小的、微
8、量的microphone,microwave;mid-中部、当中midland,midwife;mini-极小的、极短的minibus,minimum;mis-错、不当、相反misery,mismatchm
