contradict, deny, oppose, refute
这些动词都含否定，否认，反驳，反对之意。
contradict : 指肯定地否认、反对或反驳某事，坚持相反的意见。
He contradicted his own statement.(他否认他自己说过的话。)
deny : 普通用词，侧重否认意见或言论的真实性，尤指否定他人的指控或责难。
He denied knowing anything about their plans.(他否认知悉他们的计划。)
oppose : 普通的广泛用词。指不作争论或不提出论据而无理由地反对;也指任何温和、有理由的反对或否定。
The old man cant bear anyone in the family to oppose him.(这位老人决不能容忍家里有人违抗他。)
refute : 语气较强，强调凭推理或证据驳斥一项主张或言论。
The meeting was very lively and informal with everyone chipping to supplement or refute what the speakers said.(会议开得很活跃, 不拘束, 每个人都能插话补充, 或反驳发言者的讲话。)
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