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1·Save your breath—you'll never persuade her.

不用白费口舌了—你永远说服不了她。《牛津词典》

2·Save your breath. He won't listen.

省省吧。他不会听你的。

3·A: Save your breath. You'll never persuade him.

甲：你省点力气吧，你是劝不动他的。

4·Save your breath/energy, he won’t listen to you.

你省省力气吧，他不会听你的。

5·Save your breath. You'll never persuade him.

你省点力气吧，你是劝不动他的。

6·Save your breath; you'll never persuade her.

不要白费口舌了，你说服不了她。

7·Save your breath; you'll never change her mind.

别费口舌了，你永远改变不了她的主意的。

8·Save your breath; the boss will never give you the day off.

省点口舌吧，老板不会给你一天假的。

9·Save your breath, I know that my boyfriend has been cheating on me.

省省你的力气吧，我一向都知道我的男朋友欺骗我。

10·So save your breath, I will not hear. I think I made it very clear.

省省你微弱的语气，我听不到。我想我说得够明了。