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.
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解释
impugn 在本句中指在公开场合（辩论）质疑对方的道德品格。
The opposition leader seized every opportunity to impugn the prime minister's integrity during the debate.
impugn 在本句中指在公开场合（辩论）质疑对方的道德品格。