save your breath 

used to say that it is not worth talking to someone because they will not listen to you

不值得浪費(fèi)口舌;不必對(duì)牛彈琴

I don't know why I even try to talk to him - I might as well save my breath. 

我不知道為什么要費(fèi)口舌和他說話——最好還是不要對(duì)牛彈琴。

A: Matt's work is such a mess! I think I need to talk to him about it. 

馬特的工作真是一團(tuán)糟!我覺得得跟他談?wù)劻恕?/p>

B: You might as well save your breath. He just doesn't listen to reason.

你就別白費(fèi)口舌了，他壓根就不聽勸。

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