快速答案
despender 表示耗费资源；dispensar 表示释放、免除或无需某物。
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
despender
to expend
Use despender for spending money, time, energy, or effort on something.
dispensar
to dismiss, exempt, or do without
Use dispensar for releasing someone, waiving a requirement, or not needing something.
如何选择
- despender: Choose despender if the sentence points to spending money, time, energy, or effort on something.
- dispensar: Choose dispensar if the sentence points to releasing someone, waiving a requirement, or not needing something.
例句
O projeto despendeu mais recursos do que o previsto.
The project expended more resources than expected.
O regulamento dispensa a apresentação do documento.
The regulation waives presentation of the document.
常见误区
Despender is formal and normally concerns expenditure. Do not confuse its conjugation with forms of 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 despender，一次用 dispensar。如果两个版本都可以，说明意思怎样变化。