save your breath “省省吧！”（非正式）
英文释义
Expression meaning discussion is useless; there is nothing you can say or do to change the situation.
My younger brother said he hoped he could get a big raise this year, but I said save your breath, because I know his company is in big trouble financially.
我年轻的弟弟说，他希望今年能得到大幅加薪，但我对他说：“省省吧！”因为我知道他的公司在财务上陷入了大麻烦。