快速答案
impugnar 正式挑战有效性或可受理性；contestar 更广泛地表示争议或反对。
可靠的方法是先判断这个词在句子里的功能，再翻译。
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每个词的作用
impugnar
to formally challenge
Use impugnar for attacking the validity, admissibility, or correctness of an act, document, candidate, or evidence.
contestar
to dispute or answer a claim
Use contestar for opposing an assertion or decision, including responding to a legal action.
如何选择
- impugnar: Choose impugnar if the sentence points to attacking the validity, admissibility, or correctness of an act, document, candidate, or evidence.
- contestar: Choose contestar if the sentence points to opposing an assertion or decision, including responding to a legal action.
例句
O partido impugnou a candidatura.
The party challenged the candidacy.
A empresa contestou os valores cobrados.
The company disputed the amounts charged.
常见误区
Not every disagreement is an impugnação. The formal remedy usually requires a defined object and procedure.
放到语境中练习
从你的真实生活中选一个句子，写两遍：一次用 impugnar，一次用 contestar。如果两个版本都可以，说明意思怎样变化。
循序渐进学习巴西葡萄牙语
创建账号，在 Falando 继续学习这个主题。
免费账号，包含 A1 课程。