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