We have to resolve this matter once and for all.我们必须彻底解决这一问题。The teacher has warned the student once and for all.那位老师已断然警告那个学生.He will explain it fully once and for all.他将把它充分地解释一次就此了结....

一次了结地， 一劳永逸地，彻底地，最终地...

once and for all的音标：once and for all的英式发音音标为：[wʌns ænd fɔ: ɔ:l]once and for all的美式发音音标为：[wʌns ənd fɔr ɔl]...