快速答案
despensa 指储藏食品用品的房间；dispensa 表示免除某人的义务或职务。
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
despensa
pantry or storeroom
Use despensa for a room or cabinet where food and household supplies are kept.
dispensa
dismissal, exemption, or act of dispensing
Use dispensa for release from a duty, dismissal from work, or permission not to meet a requirement.
如何选择
- despensa: Choose despensa if the sentence points to a room or cabinet where food and household supplies are kept.
- dispensa: Choose dispensa if the sentence points to release from a duty, dismissal from work, or permission not to meet a requirement.
例句
Guardamos o arroz na despensa.
We keep the rice in the pantry.
Ela pediu dispensa da reunião.
She asked to be excused from the meeting.
常见误区
The related verbs make the spelling clearer: despensa is a place; dispensa comes from dispensar.
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 despensa，一次用 dispensa。如果两个版本都可以，说明意思怎样变化。