What does the theory of plate tectonics maintain?这板块构造学说的理论讲些什么?Geologists describe the motion of the plates and the consequences of such motion as plate tectonics.地质学家把板块运动及这种运动所造成的后果看作是板块构造运动.The idea of sea - floor sp...
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...