快速答案
conhecido 可表示熟悉或认识的人；famoso 表示广为人知。
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
conhecido
known or an acquaintance
Use conhecido for recognized by a group, familiar, or a person one knows but not closely.
famoso
famous
Use famoso for widely known by many people, often publicly.
如何选择
- conhecido: Choose conhecido if the sentence points to recognized by a group, familiar, or a person one knows but not closely.
- famoso: Choose famoso if the sentence points to widely known by many people, often publicly.
例句
Ele é um conhecido da família.
He is an acquaintance of the family.
A cantora ficou famosa no Brasil.
The singer became famous in Brazil.
常见误区
Uma pessoa conhecida may be your acquaintance, not a celebrity. Context decides whether conhecido is an adjective or a noun.
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 conhecido，一次用 famoso。如果两个版本都可以，说明意思怎样变化。