Her jealousy is the mainspring of the novel's plot.
这部小说情节中贯穿了她的忌妒之心.
📖 牛津释义
mainspring
n
1 principal spring of a clock or watch (钟表的)主发条.
2 (fml fig 文, 比喻) chief motive or reason (for sth) (某事的)主要动机或原因
Her jealousy is the mainspring of the novel's plot. 这部小说情节中贯穿了她的忌妒之心.