当他想要某样东西时，会表现得非常坚持不懈。

He can be very ___persistent when he wants something.

她坚持不懈的努力最终带来了研究上的突破。

Her ___persistent efforts finally led to a breakthrough in the research.

尽管屡遭挫折，他们为变革而进行的坚持不懈的倡导从未动摇。

Despite repeated setbacks, their ___persistent advocacy for change never wavered.