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Our equilibrium molecular dynamics (MD) simulations for aqueous sodium chloride solutions revealed that,supplementary to the Debye-H(u)ickel theory,reversible transient nucleation of ions was observed even in dilute solutions.The average size of formed ion clusters and the lifetime of ion pairs increases with concentration until the saturation point,when ion clusters become stable and individual ions adjust their positions to form ordered lattice structures,leading to irreversible ion crystallization,which is beyond the description of the classical nucleation theory.