save your breath
不要浪费时间和精力去说服别人或试图影响他们的决定，因为他们不会改变主意。
口语·劝人放弃
英文释义
to not waste your time and effort trying to convince or persuade someone, as they are unlikely to change their mind
例句
Save your breath—he won't listen anyway.
典故来源
源自17世纪，呼吸代表说话能量，节省呼吸即停止无效劝说。