aero-：concerning the air of aircraft

　　plane—aeroplane

　　space—aerospace

　　anti-：against；opposite of

　　nuclear—antinuclear

　　matter—antimatter

　　war—antiwar

　　auto-：of or by oneself

　　biography—autobiography

　　criticism—autocriticism

　　be-：to treat as the stated thing

　　friend—befriend

　　little—belittle

　　bi-：two；twice；double

　　lingual—bilingual

　　cycle—bicycle

　　bio-：concerning living things

　　chemistry—biochemistry

　　sphere—biosphere

　　by-，bye-：less important

　　produce—by-produce

　　way—byway

　　centi-：hundredth part

　　grade—centigrade

　　meter—centimeter

　　co-：together，with

　　author—coauthor

　　exist—coexist

　　col-：(used before l ) together，with

　　location—collocation

　　com-：(used before b，m，p ) together，with

　　passion—compassion

　　con-：together，with

　　centric—concentric

　　federation—confederation

　　contra-：opposite

　　diction—contradiction

　　natural—contranatural

　　cor-：(used before r ) together，with

　　relate—correlate

　　respond—correspond

　　counter-：opposite

　　act—counteract

　　attack—counterattack

　　cross-：across；going between the stated things and joining them

　　country—crosscountry

　　breed—crossbreed

　　de-：showing an opposite；to remove；to reduce

　　code—decode

　　value—devalue

　　dis-：not；the opposite of

　　advantage—disadvantage

　　agree—disagree

　　honest—dishonest

　　em-：( used before b，m，p ) to cause to become

　　body—embody

　　power—empower

　　en-：to cause to become；to make

　　danger—endanger

　　large—enlarge

　　ex-：former ( and still living )

　　minister—ex-minister

　　wife—ex-wife

　　extra-：outside；beyond

　　curricular—extracurricular

　　ordinary—extraordinary

　　fore-：in advance，before；in or at the front

　　arm—forearm

　　warn—forewarn

　　il-：( used before l ) not

　　legal—illegal

　　literate—illiterate

　　im-：( used before b，m，p ) not

　　moral—immoral

　　possible—impossible

　　in-：not

　　direct—indirect

　　sensitive—insensitive

　　infra-：below in a range；beyond

　　red—infrared

　　structure——infrastructure

　　inter-：between；among

　　change——interchange

　　national——international

　　intra-：inside，within；into

　　city——intracity

　　department——intra-department

　　ir-：(used before r)not

　　regular——irregular

　　responsible——irresponsible

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