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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;
2、 clued,clus闭合include,exclusion;cur,curr跑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transfe
3、r,conference; flect,flex弯、曲reflect,flexible;flu流fluid,influence,fluent; gen起源、种类、人种intelligence,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phot
4、ograph;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,manipulate; miss,mit送、派、放开transmit,permit;pel推、逐expel,propeller; pend悬挂indispensab
5、le,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revolve,revolution;
6、 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,
7、bimonthly;centi-百century,centigrade; co-共同，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、
8、除去discriminate,disorder;en(m)-使成为、使进入enable,enclose; ex-向外、出自、超出、离开exceed,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,i
