不可同日而语
Can't be mentioned on the same day.
Not to be mentioned in the same breath. Not to be lumped together.
eg：John's idea is different from Jean's, they can't be mentioned on the same day.
中英俚语俗语来源：汉书·息夫躬传：“臣与禄(公孙禄)异议，未可同日语也。”
反义词：相提并论 Place on par.
