impugn

反对党领袖在辩论中抓住一切机会质疑首相的正直品格。

The opposition leader seized every opportunity to ___impugn the prime minister's integrity during the debate.

在交叉询问中，律师试图质疑法医专家的鉴定结论。

During cross-examination, the lawyer attempted to ___impugn the forensic expert's findings.

你没有资格质疑她的奉献精神——她已经为这个组织辛勤工作了二十年。

You have no right to ___impugn her dedication—she has worked tirelessly for this organization for twenty years.