以下的前缀都表示否定
纯否定
a-,an-asymmetry(不对称)anhydrous(无水的)
dis-dishonest,dislike
in-,ig-,il,im,irincapable,inability,ignoble,impossible,immoral,illegal,irregular
ne-,n-,none,neither,never
non-,noesense
neg-,neglect
un-unable,unemployment
表示错误的意义
male-,mal-malfunction,maladjustment(失调)
mis-mistake,mislead
pseudo-pseudonym(假名),pseudoscience
表示反动作的意思
de-defend,demodulation(解调)
dis-disarm,disconnect
un-unload,uncover
表示相反，相互对立意思
anti-,ant-antiknock(防震),antiforeign,(排外的)
contra-,contre-,contro-contradiction,controflow(逆流)
counter-counterreaction,counterbalance?
ob-,oc-,of-,op-object,oppose,occupy
with-withdraw,withstand
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