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In ancient times, Zhan He was lecturing at home, with his disciples attending him.
The sound of a cow bellowing came from outside the gate.
One disciple guessed it was a black cow with a white forehead.
Zhan He, using his Taoist arts, acknowledged it was a black cow but said the white part was on its horns.
He sent someone to verify, and it turned out to be a black cow with a piece of white cloth wrapped around its horns.

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Open the tool →黑牛白角 (hēi niú bái jiǎo) is a Chinese idiom (chengyu) meaning “to emphasize the necessity of acting in accordance with objective principles and verified facts, rather than relying on superficial observations or assumptions”.
黑牛白角 is pronounced hēi niú bái jiǎo in Mandarin Chinese.
Literally, 黑牛白角 means “Black cow, white horns”. It is used to mean “to emphasize the necessity of acting in accordance with objective principles and verified facts, rather than relying on superficial observations or assumptions”.
黑牛白角 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
形容办事一定要遵循一定的客观规律