tā / gēn / wán / quán / bù / dǒng / yīn / yuè / de / rén / tán / yuè / lǐ / jiǎn / zhí / shì / duì / niú / tán / qín

他跟完全不懂音乐的人谈乐理，简直是对牛弹琴。

Explaining music theory to someone who knows nothing about music is like playing music to a cow.