A bull's head is not a horse's mouth(niú tóu bù duì mǎ zuǐ)

A bull's head is not a horse's mouth

It's an idiom, which means doing things too illogically.

It means that the answer is not what you asked or that the two answers do not agree. It also means that doing things is too illogical. [source]: the eleventh volume of Ming Dynasty's Feng Menglong's "general admonition of the world": "zaoli spat on his face and scolded:" hell, my father's surname is Gao. He's from Jiangxi. He's a bull's head but not a horse's mouth! " [example]: as long as people give him a bad compliment, he will be happy. The 16th chapter of Li Baojia's officialdom in Qing Dynasty

Chinese PinYin : niú tóu bù duì mǎ zuǐ