对牛弹琴的英语:play the lute to a cow -- to have [choose] the wrong audience; cast [throw] pearls before swine; play one's guitar to an ox; preach to deaf ears; talk of ice to a butterfly; talk over peop...
对牛弹琴的法语:jouer du luth devant les buffles;parler à un mur;perdre sa salive