Apples and oranges binomial
Used to refer to two objects or people that are very different
Although they are brothers, they are like apples and oranges.
These restaurants are apples and oranges, so we cannot compare them.
To be totally different from something.
The idea of this metaphor came from the difference of apples and oysters, which was first recorded in John Ray's proverb collection of 1670.
To talk the main part at once, or avoid talking about what is not important
You should get straight to the point.