快速答案
fortuito 表示偶然且不可预见的事件；aleatório 表示无确定模式或随机选择方法。
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
fortuito
fortuitous or unforeseen
Use fortuito for happening by chance or outside reasonable prediction and control.
aleatório
random
Use aleatório for selected or occurring without a determined pattern, often by a random procedure.
如何选择
- fortuito: Choose fortuito if the sentence points to happening by chance or outside reasonable prediction and control.
- aleatório: Choose aleatório if the sentence points to selected or occurring without a determined pattern, often by a random procedure.
例句
O encontro fortuito mudou o rumo da pesquisa.
The chance encounter changed the course of the research.
A amostra foi escolhida de modo aleatório.
The sample was chosen randomly.
常见误区
A random sample is aleatória by design, not fortuita. A chance encounter is fortuito even without a statistical 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 fortuito，一次用 aleatório。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。