快速答案
evitar 表示避开问题；impedir 表示阻止事件或行动本身。
可靠的方法是先判断这个词在句子里的功能，再翻译。
每个词的作用
evitar
to avoid
Use evitar for staying away from a risk, action, person, or unwanted result.
impedir
to prevent or stop
Use impedir for making it impossible or blocking someone or something from acting.
如何选择
- evitar: Choose evitar if the sentence points to staying away from a risk, action, person, or unwanted result.
- impedir: Choose impedir if the sentence points to making it impossible or blocking someone or something from acting.
例句
Evito dirigir à noite.
I avoid driving at night.
A chuva impediu o jogo.
The rain prevented the game.
常见误区
You can avoid something without stopping it for everyone. Impedir is stronger because the blocked result does not happen.
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 evitar，一次用 impedir。如果两个版本都可以，说明意思怎样变化。