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Coulomb repulsion between the unevenly-bound bonding "-"and nonbonding ":"electron pairs in the segmented, flexible, polarizable, and fluctuated "O2-∶H+/p-O2-"H-bond and the thermodynamic disparity of the segments are shown to originate the H-bond asymmetric relaxation dynamics and the anomalies of H2O upon being compressed, cooled, and confined.Consistency between experimental observations, density functional theory and molecular dynamics calculations confirmed that the resultant force of the compression, cooling-contraction, or undercoordination-induced contraction, the repulsion, and the recovery of electron-pair dislocations differentiates H2O from other materials in response to pressure, temperature and the number of molecules in cluster.One segment serves at a certain condition as the master that drives the other slave to relax in an opposite direction and the weaker segment always relaxes more than the stronger segment does, associated with phonon frequency change cooperatively.Correlation between the segment length and stiffness and the compressibility and density has been established.