快速答案
delatar 表示揭发不法行为；dilatar 表示扩大、扩张或延长。
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
delatar
to denounce or inform on
Use delatar for reporting a person’s offense or revealing their involvement to authorities.
dilatar
to dilate, expand, or extend
Use dilatar for increasing dimensions, volume, scope, or a period of time.
如何选择
- delatar: Choose delatar if the sentence points to reporting a person’s offense or revealing their involvement to authorities.
- dilatar: Choose dilatar if the sentence points to increasing dimensions, volume, scope, or a period of time.
例句
A testemunha delatou os responsáveis pelo esquema.
The witness informed on those responsible for the scheme.
O calor dilatou o metal.
The heat expanded the metal.
常见误区
Their nouns preserve the vowel contrast: delação is a denunciation, while dilatação is expansion.
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 delatar，一次用 dilatar。如果两个版本都可以，说明意思怎样变化。