坚持不懈用英语可以翻译为 persevere or be persistent。这个短语来源于拉丁语 perseverantia，意思是坚持不懈，不屈不挠。例句如下：

She persevered in her studies despite numerous setbacks.

He was persistent in his pursuit of success.

They demonstrated great perseverance in the face of adversity.

She never gave up and continued to be persistent in her efforts.