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We employ multiple order parameters to analyze the local structure of liquid water obtained from all-atom simulations,and accordingly identify three types of molecules in water.In addition to the well-known low-density-liquid and highdensity-liquid molecules,the newly identified third type possesses an ultra-high density and over-coordinated H-bonds.The existence of this third type decreases the probability of transition of high-density-liquid molecules to low-densityliquid molecules and increases the probability of the reverse one.