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The molecular dynamics method is employed to simulate the liquid-vapor nucleation processes. The results show that the initial stage of nucleus in nucleation process is cavity or space containing very few vapor molecules. Because of the very limited size of the simulation domain in previous reports, further growth of the nucleus has not been realized. Large scale molecular dynamics simulation of liquid-vapor nucleation indicates that the liquid-vapor nucleation process undergoes at least three stages: cavity growth, cavity coalescence, bubble formation.