HSK 7-9
对牛弹琴
duìniú-tánqínlit. to play the lute to a cow (idiom); fig. offering a treat to an unappreciative audience; to cast pearls before swine; caviar to the general
对不听劝的人解释如同对牛弹琴。
Duì bù tīng quàn de rén jiě shì rú tóng duì niú tán qín.
Explaining this to someone who will not listen is like playing to an unappreciative audience.
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Appears across levels (7-9) in the HSK 3.0 word list.