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In this paper, we report the realization of Mie resonances in air using eccentric hollow metallic cylinders. Our numerical results show that electric resonances/magnetic resonances can be selectively generated in a properly-designed eccentric hollow metallic cylinder under TE-/TM-polarization plane wave illuminations, respectively. We find that the critical dimension for Mie resonance generation is the radius of the hollow hole. Finally, two resonant modes supported by a dual-hole cylinder are presented. This study can be highly favorable to various applications, including optical sensing and nonlinear optics. [ABSTRACT FROM AUTHOR]