持之以恒用英语可以翻译为 "persevere" 或 "keep at it". 这个词来源于拉丁语 "perseverare"，意思是 "坚持不懈" 或 "持之以恒".

例句：

He persevered with his studies and eventually graduated with honors. (他持之以恒地学习，最终以优异成绩毕业。)

She kept at it and eventually achieved her goal. (她持之以恒，最终实现了她的目标。)