“用意志力驱使”可以翻译为“drive (oneself) with willpower” 或者 “propel (oneself) through willpower” 。
例句：
He drove himself with willpower to keep studying despite the extreme fatigue. 尽管极度疲惫，他还是用意志力驱使自己继续学习。
She propelled herself through willpower to finish the marathon, even when her legs were about to give out. 当她的双腿快要支撑不住时，她用意志力驱使自己跑完了马拉松。