bù kě tóng rì ér yǔ

ㄅㄨˋ ㄎㄜˇ ㄊㄨㄥˊ ㄖˋ ㄦˊ ㄩˇ

Idiom

1incomparable

2lit. mustn't speak of two things on the same day (idiom); not to be mentioned in the same breath