快速答案
premissa 是推理中可识别的前提命题；pressuposto 是事先默认的基础假设。
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
premissa
premise
Use premissa for a proposition from which an argument formally reasons toward a conclusion.
pressuposto
presupposition or underlying assumption
Use pressuposto for something taken for granted before an argument, plan, or utterance proceeds.
如何选择
- premissa: Choose premissa if the sentence points to a proposition from which an argument formally reasons toward a conclusion.
- pressuposto: Choose pressuposto if the sentence points to something taken for granted before an argument, plan, or utterance proceeds.
例句
A conclusão não decorre da primeira premissa.
The conclusion does not follow from the first premise.
O projeto parte do pressuposto de que haverá demanda.
The project assumes that there will be demand.
常见误区
A pressuposto can function as a premise, but many presuppositions remain unstated and need to be uncovered first.
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 premissa，一次用 pressuposto。如果两个版本都可以，说明意思怎样变化。