apples and oranges

Từ điển Oxford Advanced Learner 8th

ˌapples and ˈoranges idiom
(NAmE)used to describe a situation in which two people or things are completely different from each other
• They really are apples and oranges.
•They are both great but you can't compare apples and oranges.
•It's a totally different situation, it's apples and oranges.
Main entry: ↑apple_idiom