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During the Spring and Autumn period, Duke Mu of Qin asked Sun Yang, also known as Bole, a renowned judge of horses, to find him a thousand-li horse. As Bole grew old, Duke Mu inquired if he had a successor. Bole recommended Jiufang Gao, a humble man, to search for a fine steed.
After three months, Jiufang Gao returned and reported that he had found a magnificent yellow mare in Sha Qiu. However, when the Duke's attendants went to retrieve the horse, they found a pure black stallion. Duke Mu was displeased and confronted Bole, asking how Jiufang Gao, who couldn't even distinguish between colors and genders, could be a good horse judge.
Bole, however, explained, "This is precisely why Jiufang Gao is so extraordinary! What he observes is the horse's inner spirit and vital essence, not its superficial 'black, yellow, mare, stallion' (骊黄牝牡). He sees beyond the physical form to the true nature." Indeed, the black stallion turned out to be an exceptionally fast and excellent horse.

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Open the tool →骊黄牝牡 (lí huáng pìn mǔ) is a Chinese idiom (chengyu) meaning “to judge by superficial appearances”.
骊黄牝牡 is pronounced lí huáng pìn mǔ in Mandarin Chinese.
Literally, 骊黄牝牡 means “Black horse, yellow horse, mare, stallion”. It is used to mean “to judge by superficial appearances”.
骊黄牝牡 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
犹言牝牡骊黄。喻指事物的表面现象。