the mainspring of a reform movement改革运动的主要推动力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.My life has been music, and a constant search for it has been the mainspring of my life...我以音乐为生，对音乐的不...
那不是真皮, 只不过是仿制品.It's not real leather; it's only an imitation.橱窗里的全部物品都是仿制品.All the articles in the window are dummies.这个仿制品简直不能同原件相比.The imitation hardly matches up to the original....