快速答案
regra 是一般规则或规律；norma 常属于正式、技术或机构体系。
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
regra
rule
Use regra for a direct instruction, regular pattern, or criterion for a game or activity.
norma
standard or regulation
Use norma for a formal technical, institutional, legal, or social standard.
如何选择
- regra: Choose regra if the sentence points to a direct instruction, regular pattern, or criterion for a game or activity.
- norma: Choose norma if the sentence points to a formal technical, institutional, legal, or social standard.
例句
A primeira regra do jogo é simples.
The first rule of the game is simple.
A obra deve seguir as normas de segurança.
The construction work must follow safety standards.
常见误区
The categories overlap in law and administration. Use the institution’s official label when a document distinguishes regra from norma.
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 regra，一次用 norma。如果两个版本都可以，说明意思怎样变化。