对牛弹琴
跟他说这些高深的理论简直是对牛弹琴，他根本听不懂。
Talking to him about these profound theories is like casting pearls before swine—he simply doesn't understand.
to offer something valuable or meaningful to someone who cannot appreciate it
把这本书推荐给他纯粹是对牛弹琴，他连字都不认识。
Recommending this book to him is like casting pearls before swine—he doesn't even recognize the characters.
Often used to describe situations where advice, knowledge, or effort is wasted on someone who lacks the capacity or willingness to understand.
Related Phrases
Pro Tip
Usage Context
Use this idiom when someone is sharing knowledge or advice that is clearly beyond the listener's comprehension or interest. It implies the listener is 'the cow' who cannot appreciate the 'music.'
Word Origin
Originates from a story in the Han Dynasty where a musician named Gongming Yi played the qin (a traditional Chinese zither) for a cow, which showed no interest. The idiom metaphorically describes offering something sophisticated to those who cannot appreciate it.
Usage Notes
Commonly used in both spoken and written Chinese to criticize wasted effort or to describe someone's inability to recognize value. Often used in educational or advisory contexts.