His relentless curiosity drives his groundbreaking scientific research.

drive 在这里是动词，意思是"驱使、推动"，表示一种内在的动力或动机促使某人做某事。relentless curiosity（无尽的好奇心）作为主语，drive 作为谓语动词，说明好奇心是推动他进行科研的动力。