求单词的词根前缀后缀表答:de-, defend, demodulation(解调)dis-, disarm, disconnect un-, unload, uncover 4)表示相反,相互对立意思 anti-, ant- antiknock( 防震), antforeign,(排外的)contra-, contre-, contro-, contradiction, countercurrent (逆流)counter-, counterreaction, counterbalance ob-, oc-, of-, op-,...