waste breath
白費口舌
口語·白費口舌
英文釋義
to expend energy or effort on something that is futile or ineffective
例句
Trying to convince him is a waste breath; he won't listen.
典故來源
字面意為浪費呼吸,比喻說話毫無效果,源于日常對話中對徒勞勸說的形象描述。