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1. Introductionrn Galactic Chemical Evolution （GCE） studies are to investigate the spatial and temporal evolution of the chemical abundances in the interstellar medium （ISM） in galaxies. This process is closely related to two important parameters in galaxy evolution： the initial mass function （IMF） and the star formation rate （SFR）. It is also related to the primordial abundances, the nucleosynthesis and gas flows,