  We show that the natural motion of particles in continuous space-time (CSTM)
is not classical continuous motion (CCM), but one kind of essentially
discontinuous motion, the wave function in quantum mechanics is the very
mathematical complex describing this kind of motion, and Schrodinger equation
is just its simplest nonrelativistic motion equation, we call such motion
quantum discontinuous motion or quantum motion; furthermore, we show that, when
considering gravity the space-time will be essentially discrete, and the motion
in discrete space-time (DSTM) will naturally result in the collapse process of
the wave function, this finally brings about the appearance of classical
continuous motion (CCM) in macroscopic world.
