考研英语：Don't waste your breath 是什么意思？

　　waste your breath

　　浪费口舌,白费唇舌

　　释义：

　　If you waste your breath, you spend time and energy trying to give advice that is ignored. 白费唇舌

　　例句：

　　Honestly, you're wasting your breath - he doesn't want to hear what anyone else has got to say.

　　The tone of her voice told him he was wasting his breath.