快速答案
adiar 中性地推迟；protelar 暗示策略性、反复或无正当理由的拖延。
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
adiar
to postpone
Use adiar for moving an event or deadline to a later time, neutrally as to motive.
protelar
to drag out or delay
Use protelar for deliberately or repeatedly extending a process, often to avoid resolution.
如何选择
- adiar: Choose adiar if the sentence points to moving an event or deadline to a later time, neutrally as to motive.
- protelar: Choose protelar if the sentence points to deliberately or repeatedly extending a process, often to avoid resolution.
例句
A comissão adiou a votação para terça-feira.
The committee postponed the vote until Tuesday.
A parte tentou protelar o julgamento.
The party tried to delay the trial.
常见误区
A weather cancellation can adiar an event without anyone protelando it. Protelar often carries criticism of motive.
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 adiar，一次用 protelar。如果两个版本都可以，说明意思怎样变化。