gre考试备考：2013gre考试词汇例句详解（二）
以下为新GRE考试词汇复习资料，词汇解析后还附相关例句，考生可参考复习。 impugn: 表示怀疑; to criticize or challenge as false or questionable in nature 1) to attack with words; to question the truthfulness or integrity 2) to challenge as false, to assail impugn <> uphold 指责，攻击，反对<>支持...